Mystery over Sergio Aguero's 'stupid' foot injury Mancini, however, insisted that the injury did not happen at the player's home. He said: "We hope he can recover for Arsenal, but I don't know if it is possible. It didn't happen at home, it happened here (at the training ground). It has also been suggested that Agüero may have slipped on some detergent or fallen down some steps, leading to the injury. Football website Goal.com reported that Agüero had fallen down the steps of the team coach and landed awkwardly on his foot. Manchester City has refused to comment but Mancini will be under pressure to clarify what happened at the press conference after the game against Sunderland on Saturday. The injury of City's top goal scorer is expected to compound the club's problems as it seeks to close on Manchester United's lead in the Premier League. Mancini has admitted that he cannot trust striker Mario Balotelli after a string of unpredictable behaviour saw him gatecrash an Inter Milan press conference during a two-day rest break. City executive Patrick Vieira also sparked controversy when he alleged referees gave Manchester United beneficial treatment, helping them to reach the top of the Premier League.