Mo Salah faces a race against time to be fit for Liverpool's game with Arsenal on Wednesday night.
The Reds head to the Emirates looking to cut the gap at the top but may have to do so without their top scorer.
Salah was absent during Monday's session at the AXA Training Centre and could now be forced to sit out the clash in the capital. James Milner and Kostas Tsimikas were also missing at Kirby.
