Messi, 31, was included in the squad to travel to Italy this week and reports in Spain suggested the Argentina maestro was keen to feature in order to boost his Ballon d'Or aspirations before next month's award ceremony.
The voting processes ends on Friday, but claims have been made that Messi believes a final match-winning performance could sway the award in his favour.
His name was then withdrawn from Barcelona's squad to face Inter on Tuesday as appeared to be still in the process of recovering from the fractured arm he sustained a few weeks ago.
However, hours later the club announced the travelling squad for the match on Twitter, with his name included - claiming the medical team has given an 'all clear' verdict.