The Reds have been without both Scott McTominay and Edinson Cavani recently.
An illness for Scott resulted in him missing out on the draws with Atletico Madrid and Watford, while a groin injury means Edi has not played for United since the game against Burnley at Turf Moor on 8 February.
Earlier in the week, McTominay was pictured by our photographers during a training session at Carrington.
Cavani returned to training on Thursday and was involved once again with his team-mates today (Friday).
Ralf said the Uruguayan came through the sessions well and could make his squad for the weekend, as he looks to appear in the derby for the first time since signing in October 2020.