Slavisa Jokanovic has urged Ragnar Sigurdsson S to look no further than Stefan Johansen for inspiration.
The Icelandic international was hauled off after just 28 minutes in the Whites' 3-2 win over Nottingham Forest.
Johansen suffered a similar fate earlier this season when he was withdrawn after 32 minutes against Birmingham but the former Celtic man moved on to become one of the club's best performers.
And Jokanovic wants Sigurdsson to demonstrate the same improvement after a difficult evening against Forest.
The Fulham boss said: “He is a professional football player. A solution for him right now is in his hands. He's working hard and fighting to be in the team.
“Sometimes you can't find your best performance and football is not only one game or 20 minutes.
“There are some examples this season such as Stefan Johansen and his answer was fantastic for a player who was subbed after 23 minutes. He started to become one of my more important players in the squad.”
Jokanovic hasn't been happy with the way his side have defended in their 3-2 wins over Forest and Wigan last Saturday and is looking for an improvement against Tottenham on Sunday.
He explained: “It's good news that when we don't play a brilliant game, we win the points and it is great news for us.
“On the other side, we need to improve, not only in defensive lining but everywhere.
“We try and check ourselves and avoid some mistakes. We're always looking to update the team and fix the problems.”