Mellor was injured playing for the czechs on a wednesday international.
from the date of that international, it is exacty 21 days to the Olympiacos game.
As original medical reports stated he'd be back in 3 to 4 weeks, this is at the early part of that, so not too unbelievible.
Nice to have him back though.
I see him on the bench for Olympiakos, getting more rest and time to recover, but worth a risk if we need to, given the money at stake...