Lionel Messi, Neymar and Luis Suarez is a star-studded strike force that almost every team in the world would dearly love to have, but when the going gets tough, Barcelona turn to Jeremy Mathieu and Gerard Pique. The French centre-back flung himself through the air to reach Xavi's free kick at the back post, heading home from close range, finally breaching Celta Vigo's stern defence. It was Mathieu who had opened the scoring in the El Clasico, in similar fashion. Pique, meanwhile, just a minute before Mathieu scored, had made an incredible, game-saving tackle on Celta striker Charles, to prevent him from opening the scoring. Jeremy Mathieu (right) heads home in the 73rd minute to hand Barcelona a 1-0 lead against Celta Vigo . Celta Vigo goalkeeper Alvarez Conde (right) is unable to stop the powerful header from Mathieu . Celta Vigo: Alvarez Conde, Mallo Novegil, Cabral, Fontas, Castro Otto, Hernandez, Fernandez, Krohn-Dehli (Radoja - 67'), Orellana, Larrivey (Dias de Oliveira 71'), Agudo Duran . Booked: Krohn-Dehli, Duran . Sent off: Orellana . Subs not used: Mina Lorenzo, Lopez Sanchez, Blanco, Bongonda, Gomez Sola . Barcelona: Bravo, Dani Alves, Pique, Mathieu, Adriano, Rafinha (Xavi 58'), Busquets, Iniesta (Pedro 75'), Messi, Suarez (Rakitic 85'), Neymar . Subs not used: Ter Stegen, Montoya, Bartra, Sergi . Goals: Mathieu 73' Booked: Suarez . Ref: Inaki Vicandi Garrido . Att: 23,731 . This gritty, barely-deserved triumph helped Barcelona stay four points ahead of Real Madrid at the top of La Liga, after Ancelotti’s side's almost-harrowing 9-1 demolition of Granada . Celta Vigo’s aggressive pressing nearly paid dividends, but their hard-work and effort counted for nothing thanks to Mathieu’s goal. Their frustration manifested itself in a bizarre way, with Fabian Orellana sent off for throwing a lump of turf at Sergio Busquets. For some reason Sergio Alvarez, Celta Vigo's goalkeeper, is kryptonite for Barcelona's attacking trident, as they also failed to beat him in 90 minutes at the Camp Nou earlier this season. After Barcelona's Halloween nightmare against Celta Vigo, the directive from Luis Enrique here was not to leave with egg on their faces on Easter Sunday. Barcelona's own website stated that 'a dose of retribution' was in order, after the 1-0 defeat by Eduardo Berizzo’s side in late autumn. Before the game Spanish media wondered if the international break had happened at just the wrong time for Barcelona and just the right time for Real Madrid – something reflected in Madrid’s big win at lunchtime. The Frenchman wheels away in celebration of his second half header at the Balaidos Stadium . Gerard Pique (right) and Sergio Busquets join the French defender in celebration of his goal . With Los Blancos in disarray, a couple of weeks spent healing wounds away from the Santiago Bernabeu seemed an agreeable plan, while Barcelona's momentum was disrupted. Jordi Alba was injured playing for Spain, so Adriano Correia started in his stead. Messi, meanwhile, was dragged round the United States with Argentina, sidelined because of an inflamed foot which left him unable to put his boots on. He managed to do that here, but his presence was barely noticed on the pitch. With rival Cristiano Ronaldo scoring an incredible five goals earlier, Messi was left frustrated in his quest for the golden boot, with the Madrid man four strikes ahead of him on 36. Luis Enrique hasn't shown himself to be the sentimental type, but the former Celta Vigo manager gave Rafinha Alcantara a rare start against the team which he played for, both before moving to Barcelona at 13, and last season on loan. However, the midfielder failed to impress and made way for the legendary Xavi early in the second half. Mathieu (left) is congratulated by team-mates Lionel Messi and Neymar (right) after his goal . Javier Mascherano was suspended for accumulating too many yellow cards, as is his wont, but luckily for Barcelona Busquets was fit enough to start for the first time in over a month. Alvarez turned in the display of his life at the Camp Nou and Barcelona's attacking trident must have worried it was going to happen again, when he made a brilliant diving stop to deny Lionel Messi. Profligacy was an issue in that 1-0 defeat too, which we were reminded of when Neymar slashed the rebound high and wide. Los Celestes had made the early running themselves and Chilean goalkeeper Claudio Bravo, who boasts the best defensive record in La Liga, was down quickly to deny Joaquin Larrivey at his near post. It was Larrivey that put the first goal of the season past Bravo at the Camp Nou and he was determined not to let the Celta forward in again. With Messi quiet, it was down to the other two prongs of Barcelona's trident to try and make inroads. Neither were successful. Fabian Orellana was shown a red card for throwing a chunk of grass in the direction of Sergio Busquets . The lump of turf strikes Busquets in the neck after tempers reached boiling point . Neymar antagonised the Celta Vigo fans as he drew several fouls, but the Barcelona ones too with his incredible wastefulness. To watch him in recent weeks is to see a different player to the one that dismantled La Liga defences earlier in the season. His first touch was frequently poor, his passes off-target. Suarez, meanwhile, went down in the box looking for a penalty under an arm from Gustavo Cabral, but far too little contact to actually tumble. He was then booked on the stroke of half-time for a dive, although this time he has been charged into. The one opportunity Suarez got he hit hard and true, stinging the palms of Alvarez. But Celta Vigo were on top and Nolito was getting the better of Dani Alves time and time again. Maybe the Brazilian's mind is elsewhere, with his contract expiring in the summer, but physically he seems less capable too. Orellana (right) leaves the field after referee Inaki Vicandi Garrido brandishes a red card . The Barcelona players surround referee following a controversial decision . One horrendous defensive mix-up left Nolito charging for the ball with Bravo. The keeper got his foot to it before colliding with the Celta Vigo man, but the fans screamed for a penalty, unsuccessfully. The offside flag being raised against Orellana led to a Celta goal being ruled out, but the best chance fell to Larrivey before the interval. Orellana cut the ball neatly across the box but the striker, unmarked, nine yards out, lacked composure, hacking at it and sending it into the Vigo night sky. Barcelona continued to struggle, with Neymar’s goal harshly ruled out for offside and a shanked Alves shot the only efforts to their credit. Messi and Neymar react after another missed opportunity during a frustrating evening for the duo . Then came Pique’s tackle on Charles, with the defender making a super-human effort to get back and deny the striker. Celta Vigo were almost instantly punished for it, with Mathieu breaking the deadlock. Barcelona couldn’t kill the game, even after Orellana’s late sending off, with Messi scooping the ball over Alvarez but inches over the crossbar too. It didn’t matter; they held on to earn the three points and maintain the four-point lead over Real Madrid that they started the week with. And one game less for each side to play. It’s not pretty, it’s not ‘the Barca way’, but if Enrique lifts La Liga, nobody will be worrying about that. Neymar (right) fights for the ball against Celtais Andreu Fontas during the La Liga clash .
Barcelona struggle to 1-0 La Liga victory against Celta Vigo . Jeremy Mathieu gave Barcelona 1-0 lead with second half header . Orellana shown red card for throwing grass at Sergio Busquets . Luis Suarez shown a yellow card for diving by referee Inaki Vicandi Garrido .