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Due to Lucas' suspension, Jordan Henderson is the only player I can see who can move to centre midfield alongside Steven Gerrard, therefore leaving the right midfield/right wing-back role available.
This is probably the trickiest position to predict this weekend based upon Sterling having been introduced here in the latter stages at Sunderland.
Martin Kelly came on as the right wing-back against Man United at Old Trafford but looked exhausted after 10 minutes. I'm not so sure asking a player to play his first game in 13 months in a physically demanding role such as wing-back is wise.
Sterling's pace could also profit against Crystal Palace's full-backs.
It's worth noting that against Sunderland, Henderson, playing in this position, was in fact the third-highest player up the pitch based on average positions:
I'd expect a similar shape, with Sterling higher up and Kolo Toure covering as more orthodox right-back.