It seemed this week that Messi would do, but that does not go through.
The Spaniards had their all-star will be included to Italy, but made shortly before the commencement of the meeting, announced that he is not part of the selection. He is still not fit enough.
Messi ran two weeks ago a armbreuk. He also played already in the first duel with Inter, Barcelona won (2-0). Barcelona won so far all three group matches.
Along with Tottenham Hotspur makes PSV also part of this group.