Danny Spiller is a major doubt for promotion-chasing Gillingham's home clash against lowly Hereford.
The midfielder missed training on Thursday after being struck down with sickness and diarrhoea.
Lance Cronin will definitely miss out with measles, leaving young goalkeeper Darren Hawkes to take his place on the bench.
Striker Dennis Oli picked up a slight knock in the reserves' victory over Leyton Orient in midweek but should be fit to start in attack.
Tony Sinclair and Jack Payne have returned to full training and are in contention to make the matchday squad.
The Gills have not lost in 13 matches, leaving them firmly in the play-off picture. They were held to a goalless draw at Edgar Street in August, though.
Hereford manager Jamie Pitman faces both personnel and formation decisions ahead of the clash.
The Bulls boss made four changes for Wednesday`s convincing 4-0 defeat at Accrington as well as reverting to a 4-4-2 formation - a system last used in the 4-0 reverse at Southend.
Pitman is now likely to return to the 4-5-1 line-up that has served his side well of late against Port Vale and Crewe, although he still faces dilemmas regarding selection.
Debutant Jason Price, Rob Purdie, Richard Rose and Waide Fairhurst all came in at the Crown Ground in place of Stuart Fleetwood, Steve Leslie, Kenny Lunt and Nicky Featherstone.
And with no fresh injury problems expected, Pitman now must decide how best to tackle the sixth-placed Gills as Hereford go in search of one of the two wins that should see them safe.
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