Barca scored twice in the last three minutes to clinch a dramatic 3-2 win away at Rayo Vallecano yesterday.
He was among the travelling party that flew to Milan on Monday and trained at the San Siro with his teammates later in the day - although he does not yet have the green light from Barca's medical team to return to competitive action.
"He could be available, but we have to wait, let's see how he feels about his safety". We're continually developing and we are trying to play better and better football. "Of course, it is necessary for Messi to recover".
"There are three or four possibilities that we're studying".
He added: "The other day [vs Rayo] we started the game very well, but then it was hard for us to play as we did in the previous matches". We will not take risks.
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Barca have done well without Messi.
And Roberto has called for Valverde's charges to perform to the level they set against Real Madrid the previous weekend. Finally, Suarez scored his second and Barcelona's victor in the dying seconds of the match to rescue the full three points for the Catalan giants.
"To be in the position we're in going into the fourth game is really good", the coach said. I never made the first step to say I want this player. We have to prepare for the game well.
Inter need a win to all but book their passage to the last 16 in a group which also includes Tottenham and PSV Eindhoven. His is the shirt that children who dream of being footballers ask for", said Spalletti, "but Barcelona have shown that even without him, they still have the mentality to develop their game, which is what makes the difference.
"We're doing worse in that sense this season. We'll know more after training", added the Inter coach. "We're seeing them create very little but be efficient with the chances the do have".