Manchester United boss Louis van Gaal says striker Radamel Falcao still needs to prove himself at Old Trafford.
The 28 year old forward has scored three goals since joining United on a £6m loan move from big spending AS Monaco in the summer.
Van Gaal said: "If a player costs £95m or £5,000 to me this makes no difference, you still have to prove yourself."
Falcao was left out of United's squad for the 1-0 home loss to Southampton and with questions also being asked of Robin Van Persie's future, there is a degree of uncertainty in the Old Trafford ranks.
Falcao has started just seven league games, admittedly being hampered by injury, but his agent Jorge Mendes has suggested that Falcao may not extend his stay beyond the end of this season.
United have an option to activate a £40m buy-out clause for the striker, who earns £265,000 a week.
Van Gaal added: "He has to prove himself, this we have agreed. We have made this deal and everything is clear and it is not the end of the year (the duration of his loan spell) so he has the chance for this still.
"For the manager it is the quality of the training sessions, the quality in his performances and matches and he has to compare favourably.
"A player of £95m has to prove himself also, maybe he has less motivation so I have to be like that."
Amid talk of another major spending spree during this transfer window, van Gaal moved quickly to quell these rumours.
He said: "I don't think we shall be very active as not many players of a certain level are available, when we buy a player he has to be better than the players that are playing now and this is a difficult job."