The creative Costa Rica international has managed just five goals for the Cottagers this year - two of which came against relegated Reading in last Saturday's 4-2 defeat.
Jol said: "He is one of my better players. He's always playing for the team and looking for runners to give that last pass.
"Maybe we need another passer."
Jol has been tempted to push Ruiz further up the field - but he admits that creates problems behind the strikers.
He said: "The thing is you miss him in midfield and if he's not up front, he's playing too deep. That is my dilemma."