Blues boss Steve Tilson cannot be certain when the injured midfielder will be back.
Tilly told the Echo: "Lee has picked up a knee ligament injury but we're not sure how bad it is at this stage. We don't know if he will be fit to play against Leyton Orient on Friday yet."
With Christophe serving a one-match suspension after his controversal sending off yesterday Sawyer would be a welcome addition to the squad for Friday's game with Leyton Orient, especially as he bagged three goals in a couple of games against them last season!