The American forward inspired Fulham's 3-0 win at Bolton on Saturday with two goals.

He has now bagged 21 goals for the season and is emerging as one of the Premier League's most dangerous forwards.

His current deal is due to expire next year, and he is yet to give Fulham his answer, and Jol is anxious that he agrees new terms.

"I can't foresee the future. We want to keep him and hopefully he wants to stay. We have offered him a very good contract," said Jol.

"He knows he is very appreciated at our club, so hopefully he will stay.

"If we want to be a top side we need players who can score more than 20 goals in all competitions.

"I have always had that - I can remember Luis Suarez scoring 53 goals for me at Ajax.

"He's not at that level yet but of course it is a different league and for a wide midfield player who can play up front and score that many goals, it is unbelievable."

Jol hailed Dempsey's goal return, especially as many have come from midfield and the player himself is delighted with his form this season.

"I have never got these type of numbers before - 21 for the season, 15 for the league," he said.

"I am happy with that return and we have still got some games left, so hopefully I can chip in with a few more."