Manchester United received mixed news on their injured centre-backs before Monday's match at home to Tottenham Hotspur. Nemanja Vidic faces a longer than anticipated spell on the sidelines with a calf injury but Rio Ferdinand is expected to return sooner.
Vidic could be out for up to five weeks, while Ferdinand could be back from a hamstring problem in time for the August 28 game against Arsenal, manager Sir Alex Ferguson told a news conference on Friday.
Tottenham midfielder Luka Modric, who has been heavily linked with a move to Chelsea, could have recovered from a groin injury in time for Monday's trip to Old Trafford, local media quoted manager Harry Redknapp as saying.
Modric missed Thursday's 5-0 win over Hearts in their Europa League play-off first leg.
Chelsea manager Andre Villas-Boas must pick between goalkeepers Hilario and Ross Turnbull for Saturday's home match against West Bromwich Albion after first choice keeper Petr Cech was ruled out for four weeks with a knee injury.
"He is not 100 percent at the moment," Mancini told a news conference on Friday, saying the Argentine was still recovering from his exploits at the Copa America.
"OK, he scored two fantastic goals because he knows his job but he has to know very well his team-mates... tomorrow I will decide after the last training session [if he is fit to start]."
Aguero came off the bench in the second half to score twice and set up another in Monday's 4-0 win over Swansea City.
Arsenal defender Kieran Gibbs will miss Saturday's match at home to Liverpool with a hamstring strain, while Tomas Rosicky and Armand Traore are doubtful for the match which will mark the start of life without Cesc Fabregas.
"Rosicky has a slight thigh problem and Traore has a slight groin problem. We will make a late decision on both of them," Gunners manger Arsene Wenger said on the club's website.
