The defender is back after recovering from long-term knee injury.
"A player has to adapt," Kelly told Liverpoolfc.com. "I don't mind playing at wing-back or full-back. I can play both.
"At a club like Liverpool when you need to change, the players have got to be good enough to adapt and play the way the manager wants them to play.
"The key to our defence being solid has been good defenders who can work with each other, as well as signing a top-class keeper."
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