Barcelona coach Luis Enrique insisted his side will need an improved display when faced with the very different challenge of former Barca boss Pep Guardiola's Manchester City after laboring to a 1-0 win over Granada on Saturday.

Barca travels to Manchester on Tuesday having thrashed Guardiola's men 4-0 less than two weeks ago to take a commanding lead of UEFA Champions League Group C thanks to a Lionel Messi hat-trick.

However, Messi, Luis Suarez and Neymar endured a rare off night in front of goal as midfielder Rafinha bagged the only goal against an ultra defensive-minded Granada.