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It's no coincidence that Liverpool lost the midfield battle to Arsenal without Lucas Leiva.
Against the Gunners, the Reds needed a player to cover the defence, especially with Glen Johnson and Jose Enrique so far advanced at times.
They may have played with two deeper midfielders in Joe Allen and Nuri Sahin, but both are playmakers with the tendency to move forward with the play and dictate attacks up to the final third.
It's how both players made their names in the game, but when they were doing it for Swansea City and Borussia Dortmund, they both had more disciplined partners giving them license to create.
But now working together at Liverpool, neither player wants to take on the dirty work—they both want to be Paul Scholes, not Michael Carrick.
Unless one of them can replace of impact Lucas and perform his role, Rodgers could have another big problem on his hands.
Sahin was brought in to cover the loss of Lucas and provide stellar competition for Joe Allen when the Brazilian returns.
However, at 23 and desperate to make an impact at Real Madrid, the Turkey international seemingly prefers to take over the playmaking himself, making the glamorous passes to show Jose Mourinho what he's missing.
Trouble is, Allen is the man Rodgers wants to fill that role long-term for Liverpool.
The styles of Sahin and Allen are too similar for a stable midfield, and one will need to compromise and stay defensively disciplined if the Reds are to win the midfield battle and stop conceding so frequently.
If both play like they did against Arsenal, Brendan Rodgers won't have too many qualms about his midfield on the ball, but will have a big problem with them off it.
And with a plethora of problems already in the team, the Liverpool boss won't want another one with his two most technically gifted players.