Carlos Tevez fears his first season with Manchester United could be severely handicapped due to lack of pre-season preparation.
Tevez had been in peak condition after helping his country to the final of this summer's Copa America, but is now kicking his heels ahead of his Old Trafford switch.
The all-action striker is mentally prepared for linking up with Sir Alex Ferguson's side but fears he is missing out on much needed pre-season work with his new colleagues.
Real handicap"We need a solution quickly so that I can get on with my career," Tevez told the Daily Mail.
"To play for a super club like Manchester United without any pre-season work behind me is going to be a real handicap.
"I am a fighter and am prepared for any challenge. But this is going to be very difficult.
"I desire a swift solution and demand now that all parties arrive at an agreement because I just want to play.
"Mentally I am prepared to play for United at any moment, but physically it may be more difficult the longer it goes on."