-LRB- CNN -RRB- -- Inter Milan came from behind to win for the second time in a week to keep their Italian title hopes alive with a 3-1 victory over relegation-threatened Atalanta on Saturday . Jose Mourinho 's team followed up the stunning midweek victory over European champions Barcelona to move two points clear of second-placed Roma , who host Sampdoria on Sunday . But key Dutch midfielder Wesley Sneijder is in doubt for the second leg of the Champions League semifinal in Spain on Wednesday after coming off at halftime with a thigh injury . Atalanta , third from bottom with three matches to play , took a shock fifth-minute lead through Simone Tiribocchi but Inter hit back with three unanswered goals as they did against Barca . Argentina striker Diego Milito scored his 20th Serie A goal of the season to level with a lob in the 24th minute , then Kenyan midfielder McDonald Mariga scored his first for the defending champions with a shot that deflected in off teammate Sulley Muntari . Cristian Chivu , playing at left-back in a revamped defense due to absent Brazilian right-back Maicon 's dental problems , sealed victory with 13 minutes to play with a super long-range shot to extend the Nerazzurri 's unbeaten home run to 40 league games . The Romanian was delighted after scoring his first goal for Inter following his move from Roma in 2007 . `` We 're pleased with the victory . It was n't easy because we were behind , but we knew how to react , '' he told the club 's Web site . `` It was an important goal for me and the team : for me because it has n't been an easy period for me , and for the team because we have to keep winning until the end . Roma 's game tomorrow ? I wo n't watch it . The last time I watched Roma , they won . `` From tomorrow we will start thinking about Barcelona . It 's a historic moment for us . We have to give our all . '' Third-placed AC Milan crashed to a 3-1 defeat at European hopefuls Palermo in Saturday 's late match , and now trail their city rivals by nine points with three matches to play . Palermo moved above Sampdoria into fourth spot after going 2-0 up in the first 18 minutes with goals from defender Cesare Bovo and Uruguayan striker Abel Hernandez . Dutch midfielder Clarence Seedorf pulled one back for the visitors 10 minutes after halftime , but striker Fabrizio Miccoli restored the Sicilians ' two-goal cushion on 66 .