The 28-year-old was booed off by Fulham fans after the Cottagers' 3-1 loss to Manchester United on Saturday and his manager has called for more support from the home crowd
|66/1||Fulham are 66/1 with BetVictor to win both halves against Liverpool|
And the Dutchman has urged the club's supporters to get behind his playing squad as Fulham seek to bounce back from three defeats in the space of a week.
Addressing the crowd's criticism of Ruiz, Jol said: "It was very disappointing. That (kind of abuse) is something I can cope with because I know football. I have been involved in 1,300 games and I know if people are not happy, they will give you stick.
"Bryan is a player that came back from Costa Rica's game against Mexico, he scored, they won 2-1 and he goes to the World Cup.
"Then to come here and get that sort of contradiction (in reception): over there he is a hero and here they boo him off the park.
"That is very, very frustrating for him and very disappointing for me. I wanted my supporters to stay behind my players.
"He is an unbelievably nice person so I had to whisper a few words in his ear.
"I said he is arguably my best player and that he should know that. It doesn't mean anything but at least a couple here, and I am one of them, trust him."
Fulham travel to Anfield to face Liverpool in their next Premier League match on Saturday.