The 30-year-old has flourished at Craven Cottage since joining from West Ham in 2008, leading to several call-ups to the England team.
"We feel we have a situation where we have players that can replace him if it is getting a problem," said Jol, whose side face FC Twente on Thursday evening.
"I think he has a good rhythm now and if there is a physical problem, he will tell me. We will make an assessment and I feel Bobby is a typical number nine for us.
"He is different playing for England and, while you can always pick up an injury, I feel he has a great chance of going to the European Championships.
"Bobby is a target man and holds up the ball. He does that very well and is probably the best in England or one of the best.
"The only thing you hope for is by the end of the season he gets an average of 10 or 12 goals and I am 100 per cent certain [he will].
"Clint [Dempsey] did that before as a wide player, scoring 13 goals in the league."