text: Atletico Madrid's Vicente Calderon has long been a fortress with no team scoring there in the Champions League for 663 minutes. Last season the now Chelsea goalkeeper Thibaut Courtois was the reason for that but now the man keeping the clean sheets is Jan Oblak. Sportsmail looks at the 22-year-old who has made Atletico fans forget about Courtois... and David De Gea. No one knew too much about him last season outside of Portugal and Slovenia so was it a gamble? You only have to look at his price tag to see how highly-rated he was. He cost €16million (£11.5m) and that is a La Liga record for a goalkeeper. The 22-year-old was already Slovenia's number one when he left Benfica for Madrid in the summer. With experienced goalkeepers such as Petr Cech and Pepe Reina potentially available, going for a young relatively untried keeper looked a gamble but he already looks to have been money well spent. Atletico Madrid goalkeeper Jan Oblak made a big save to deny Gareth Bale in the early minutes . Oblak gets down low to keep out a shot from Real Madrid's James Rodriguez in the second half . A success right from the start of the season? No. Simeone likes to ease in new signings especially when they are young and 31-year-old Miguel Moya was signed from Getafe in the close season as back-up. But the back-up became first choice because Oblak had a right hip injury in pre-season and wasn't 100 per cent when the campaign started. Moya played in the league with Oblak coming in for Champions League games but in his first match in Europe he conceded three goals from three shots. He has recovered brilliantly and now the clamour is for him to start all matches. Cristiano Ronaldo is thwarted in his attempt to open the scoring against rivals Atletico Madrid . He has convinced everyone in Madrid? Simeone's number two Mono Burgos is a big fan. The Argentine is a former Atletico keeper and although he doesn't train the goalkeepers he is convinced Atletico have found someone who can keep goal for them for years to come. Pablo Vercellone who is the club's keeping coach is just as excited and even Iker Casillas is a fan. The Real Madrid keeper said after Tuesday's game: 'He was fantastic in the first 45 minutes. We deserved more reward from all the chances we had but we didn't get it because he played so well.' Oblak put in an impressive performance for Atletico against their great rivals Madrid on Tuesday . And it really was a very special first half. Atletico have not allowed a team to get six shots on target in one half of football all season but he stopped them all. He also made two more stops in the second half when most of the football was being played at the other end and he had to stay awake. Has he fitted into the dressing room? He speaks some English, some Portuguese, and some Spanish so he can make himself understood without problems. Still only 22 and living his first year in Spain he is predictably introverted but has a strong enough personality to impose himself on his defence. Oblak  stops Bale's attempt on goal during the Champions League quarter-final first leg on Tuesday . Other strengths? We saw the shot stopping on Wednesday but his distribution is also a weapon for Atletico. They were camped in their own half in the first 45 minutes against Real unable to get their passing going. Oblak's long – and importantly accurate – throws and kicks forward to Mario Mandzukic were an important release. How good can he become? So good he'll be sold? Atletico have already lost two brilliant keepers in De Gea who they could only keep for one season and Courtois who they were not able to take from Chelsea. They will not want to lost Oblak and with foreign investment from the Wanda group in China the club does not have to sell it's best players – he's at Atletico for good. Atletico lost two brilliant keepers in De Gea  and Courtois but the future looks bright with Oblak .
target: Atletico Madrid 0-0 Real Madrid: Click here for Martin Samuel's report .
  Jan Oblak was the difference between a defeat and a clean sheet .
  The Atletico goalkeeper denied Gareth Bale and James Rodriguez .
  READ: Mario Mandzukic the new Diego Costa for Atletico Madrid?