Manchester United boss Sir Alex Ferguson has defended his medical staff in the wake of criticism from Owen Hargreaves.

Hargreaves, who made an outstanding goalscoring debut for rivals Manchester City on Wednesday night, claimed he felt like a "guinea pig" as he was given several injections which he believes actually hindered his recovery.

"We're trying to analyse all the stuff he has said and there will be a statement later to address that," Ferguson said.

"As far as I am concerned my medical staff is one of the main reasons why we have been so successful over the last few years.

"Do you think we would be successful if they were not 100% brilliant? Our doctor and his five physios are fantastic - that is my opinion and that is more important than what anyone else has to say about it."