Forward Tomlin and defender Phillips both missed Tuesday's 2-1 Johnstone's Paint Trophy success over Brentford due to injury, and the pair face a race against time to be fit to line up against The Cod Army.
But they are not the only ones, with midfielder John Spicer (virus) among those also struggling.
Manager Paul Sturrock told the club's official website: "We've got a few niggles and knocks, we've now played 26 games in just a few months so it's tough.
"Gavin and Mark will have fitness tests along with a few others while there have been a couple like John Spicer who have been suffering from a virus."
Midfielder Michael Timlin definitely misses out having picked up his fifth booking of the season in midweek, incurring an automatic one-match suspension.
Marc Laird, however, does return to the fold having been cup-tied against Brentford.