Although Messi is back in the squad for the first time since breaking his arm, he has not been given the medical all-clear yet.
Messi was originally ruled out for three weeks which means he wasn’t really expected to return to action before next weekend.
However, he returned to training last week and has now been deemed fit enough to make the squad.
Ernesto Valverde spoke about Messi after Saturday’s late win over Rayo Vallecano but didn’t give much away other than to say he’d see how he looked in training on Sunday.
There seems absolutely no reason at all to risk Messi. The team have won all their matches without him and are in good shape in the Champions League, three points clear at the top of Group B.