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The Spain international goalkeeper has been invited by the Dutchman to use the Red Devils’ training facilities to regain his full fitness.
Valdes, who worked with Van Gaal at Barcelona, is without a club at the moment and has been strongly linked with a move to Liverpool.
However, Van Gaal has hinted that he could sign the 32-year-old custodian.
Van Gaal also elaborated on his relationship with Valdes and is quoted as saying by United’s official website: ‘It is not a surprise because I have done it with lots of players. I have a relationship with a lot of them.
‘I gave Ronald de Boer and Edgar Davids training possibilities in the past - Valdes is one of these players. Robin van Persie also. When he played for me in the Dutch squad, I allowed him to use our medical department to keep fit for the World Cup. I wasn't the manager of United at the time, so I have always done it’.
‘He has said that and it's remarkable because not many people talk about that’, said the 63-year-old when informed that Mourinho said that he learned from him at Barcelona.
‘He says it not only about Louis van Gaal but Bobby Robson. I appreciate it but you always do it by yourself. I was also an assistant coach and my eyes were also opened and it’s good that his eyes were open when he was my assistant, but you do it by yourself’.
Looking ahead to Sunday’s Premier League clash against Chelsea at Old Trafford, the United boss stated: ‘Chelsea are one of the top teams, as are Manchester City at the moment. Jose [Mourinho] has worked more than a year with his team and last year didn't win anything.
‘You have to build up. They are playing like a team and we have to as well, but to play for 90 minutes. We played as a team against West Bromwich Albion but made individual errors’.