Emre Can has been used in several roles since his arrival at Liverpool.
Jordan Henderson is close to returning to the Liverpool side after a spell on the sidelines through injury, so who would make way for the Liverpool captain?
How Liverpool's midfield looks will be an essential part of the Reds' game plan against Manchester United.
Emre Can has only had two substitute appearances in the Premier League, but will be hoping to prove himself in the coming weeks after recovering from ankle injury suffered with Germany's under-21 side.
Rodgers believes that Joe Allen's absence has been a big loss for the Reds so far.
Joe Allen was the man given the responsibility to replace Jordan Henderson in midfield yesterday.
Liverpool midfielder Joe Allen has said he can operate in a number of different positions.
Liverpool were well beaten in the first meeting between the two sides in November.
Many fans may have been concerned, but the central area proved to be a strength with Liverpool rather than a weakness.
With Steven Gerrard out injured for Liverpool, responsibility fell to the younger players in the squad. Maybe this is the beginning of a transition.