The Italian manager claims that his players are suffering with fatigue but revealed that Sergio Aguero and Joleon Lescott could return from injury on Sunday against Arsenal.Manchester City manager Roberto Mancini has demanded his side remain united in their bid to win the Premier League title and shrug off the signs of fatigue that have affected their performances in recent weeks.City have drawn their last two matches and have fallen five points behind leaders Manchester United, who could pull a further three points clear on Saturday should they beat Queens Park Rangers at Old Trafford.Arsenal host City on Sunday and Mancini acknowledges that the squad cannot use tiredness as an excuse should they fail to haul in Sir Alex Ferguson\'s side.“After seven months it could be that we have some players tired but it is not only us. The other teams have tired players,” the Italian coach admitted to reporters.“In this moment it is important to be strong.“It is easy to be together when you are on the top for seven months and you win every game. But you can pass by these difficult moments.”Sergio Aguero is set to return for the Blues after missing the last two games with an ankle injury, while Joleon Lescott has recovered from a groin problem.Mancini explained: “I think we will recover Joleon and probably Sergio.I don\'t think we have injuries for Sunday. Sergio is fit, he has started to train.”