Jersey's director of rugby Ben Harvey says the club's next two games are key to their chances of winning National One and promotion to the Championship.
The island side travel to leaders Ealing in their first game of 2012 before hosting third-placed Rosslyn Park a week later.
Jersey would be top of the table but for a five-point deduction after fielding an ineligible player.
"The next two games are absolutely vital," Harvey told BBC Radio Jersey.
"We know we have really got to dig deep to do something in this league," he added.
"It's a long time to go, there's 13 games left, which is a lot, and six of those are away from home.
"If we are truly going to make sure that we are regarded as the best side in the league we've got to go away to Ealing and win," he said.
Jersey's only defeat at their St Peter home in 2011 came against Ealing early on this season.
The west London side had taken command at the top of National One, but have won just one of their last five matches and their lead has been cut to a single point.
Jersey and Ealing have battled it out at the top of their leagues for the past two seasons.
Last season Ealing pipped Jersey to the National Two South title, although the island side inflicted the only defeats on the Trailfinders that season, beating them at St Peter in October 2010 and in London in February this year.