Roberto Mancini has admitted he cannot be sure how long Carlos Tevez might stay at Manchester City.

Reports this week quoted Tevez's representative Kia Joorabchian as claiming the Argentina striker, who scored his 50th goal for City in Sunday's 5-0 FA Cup victory over Notts County, would be happy to rejoin the Brazilian side Corinthians, a move he was confident he could seal for his client within the next couple of years.

Tevez's current deal with City runs until the summer of 2014 and the Manchester City manager, when asked if he felt keeping hold of the club captain would be a problem, said: "I don't know this. I'm happy for Carlos because he has scored 50 goals for Manchester City and I hope he can continue to score but in football it is impossible to know what will happen in the future. I hope Carlos can continue to play here."

Mancini said he was not concerned by the speculation and that his focus was on City's remaining fixtures this season, starting with the Europa League round-of-32 second leg against Aris Thesaloniki on Thursday night.

"At this moment I am worried only about the game, not about other things," the Italian said. "I am worried about the championship and the cups. For the moment Carlos is here, he plays for Manchester City. He is important but in the squad there are more than 20 players who are all important.

"It is normal when you have a striker like Carlos, or Mario [Balotelli] or [Edin] Dzeko, that it is important they play. But I don't know what will happen next year."

Before the match with the Greek side, with whom they drew 0-0 in the first leg, City have been hit by the news that the goalkeeper Shay Given could be out of action for three months with a shoulder injury.

Balotelli is fit to play despite suffering a clash of heads in the game at the weekend, while Shaun Wright-Phillips is also in contention again, having been sidelined with a back problem. Micah Richards has picked up what appears to be a calf injury, though, so will not feature, and James Milner (hamstring), Nigel de Jong and Adam Johnson (both ankle) remain in the treatment room.

Meanwhile the Spanish forward David Silva, who joined City from Valencia last summer, dismissed talk that he is unsettled in England and looking for a return to his native country.

"I was as surprised as anyone else here to have read those reports," Silva told the City website. "I do the odd interview with Spanish press but I have never come out with these quotes that may or may not have been attributed to me. My initial reaction was surprise but, as I have said before, I am happy to be here and I find myself very much at ease with life here.

"The thing about a big city like Manchester is that people respect your space. They leave you to get on with your life. In Spain people can get on your back and maybe live the game more. Here it's nice to go out and chill in the city."