Barcelona could be without on-form midfielder Sergi Roberto for Saturday's visit of Real Sociedad after picking up an ankle injury in the European champions' 6-1 thrashing of Roma on Tuesday.

A club statement said the 23-year-old had suffered a "bruised right ankle" before being replaced midway through the second-half of the Champions League match.

Roberto was one of the stars of Barca's 4-0 humiliation of Real Madrid last weekend and has become an important utility player for boss Luis Enrique this season this season.