The 30-year-old was the Cottagers' standout performer in the midweek Europa League defeat of Odense in Denmark.
Johnson netted both goals in the 2-0 victory, leading to praise from manager Martin Jol.
The Dutchman also revealed after the game that Johnson has turned down a new two-year deal with the club, but the striker insists he wants to remain at Craven Cottage past the expiration of his current deal next summer.
"Of course I want to stay at Fulham," he said.
"I think all you've got to do is look at my performance against Odense.
"You're asking a player whether he wants to stay at the club but you've just got to look at what I've done on the pitch.
"The work ethic I put in week in, week out when I play and when I come on as a sub.
"I want to stay but that will take care of itself in time. I've been in talks with the club for a while but it has been a busy period.
"We've just come out of the transfer window, we've had new players settling in so it is something that is ongoing but hopefully it will get resolved."
Johnson's brace was the catalyst to Fulham ending an eight-game winless streak that stretched back to mid-August.
The poor run of form sees them lie 17th in the Barclays Premier League, although the former Everton striker insists the squad have remained confident throughout.
"We've got an experienced team, experienced lads so we always knew that it was going to change sooner or later," he said.
"We know we have been playing well enough it is just getting that bit of luck in front of goal.
"We got that against Odense and could have had a few more.
"The team is creating a lot of chances so we've just got to keep it tight at the back and keep stepping it up at the top.
"We're delighted with that win and I am delighted with the two goals as well."
The striker's performance at the Odense Stadion has strengthened his call for a starting berth against QPR on Sunday
Johnson has now netted six goals in nine Europa League games but insists team success is more important than personal glory.
"All I can do is keep working hard in training day in, day out," he added.
"When I am selected and called upon I do the best I can.
"I like to think I did that against Odense and I was delighted with two goals, more so with the second one.
"But it was a great team performance away from home.
"We showed great character and, like I say, we've not won in a while so it is really important going into Sunday's game with a win under out belt."