Stuart Fielden is aiming to match his return to fitness with a return to form.

The Bulls prop returned from a knee injury against Leeds three weeks ago but has yet to rediscover the awesome form which has seen him become one of the most respected players in Super League.

And ahead of tomorrow's clash at London, the Great Britain star said: "I am happy that my knee is holding up but I have been disappointed with my own performances.

"I have spoken to our forwards coach Bernard Dwyer and he said 'what do you expect, coming back from injury?' I've expected to be exactly how I'd be if I hadn't got injured.

"But really, I've still got a knee that will take a long time to solidify and get back to how it was, even though it's fine to play with.

"I'm expecting to go on and change the game and I feel as though I am way below the standards I have set myself."

However, Fielden is keen to make and impact at Griffin Park tomorrow, as the Bulls head for the capital aiming to bounce back from the defeat at Wigan.

"The great thing about rugby league is that I can go out this weekend, make my mark and really feel I've been positive for the team.

"So, hopefully I am going to start this weekend by building my performances up towards the play-offs, the Grand Final and the Aussies in November."

Coach Brian Noble is fully aware that with a tough run-in, the Bulls can ill afford any slip-ups.

He said: "I think all the games are very significant from now until the end of the season.

"We want to finish top of the table but that will depend on how well we play in the last four games of the season. Realistically we have to win three of those. I know we are capable of doing that but we need to focus on each game as it comes."

The Bulls boss believes that last month's 60-6 annihilation of the Broncos at Griffin Park will serve as a motivational factor for Tony Rea's side.

"We embarrassed London slightly when we played them last month and that will help to motivate them for this weekend's game," said Noble.

"They were off the pace a bit that night but we have watched the tapes of their last couple of games and they are a very good side.

"They have some high quality players who are all playing well and they have added a few new signings, which will give them fresh impetus for the end of the season. They are also chasing a place in the top six and will be looking to get further up the ladder this weekend."

Noble is confident that his side can rediscover their winning streak at Griffin Park and maintain their position at the Super League summit.