Jol has faith that Ruiz will be top Fulham player
Jol insists there is no point in trying to rush things with any player new to the hustle and bustle of the Barclays Premier League.
"When he signed I said 'give him three weeks' which was of course a joke. I feel 50% of the foreigners will not do well, it is very difficult when you come to this country. There is a group of players who need a couple of months, or even a year," Jol said.
Jol added: "Of course I have to be patient with him and so do the fans - you have to have the same attitude with all the foreigners.
"We have got four good offensive players and Bryan can get all the time in the world if everybody is fine [fit].
"It is not about Ruiz, it is about the team.
"If you look at all the good teams, they have six or eight offensive players.
"In a year's time, it is important for me that you can look at his statistics, his productivity and then you will see Bryan Ruiz will be up there with our best players."