The Barcelona captain returned to training on Wednesday just 11 days after fracturing his arm against Sevilla following a nasty fall in a 4-2 La Liga win at the Camp Nou.
'Leo is at the point where he might be available, but we have to wait for the training session.
However the 31-year-old Argentine has travelled with the squad to the San Siro, and could yet be declared fully fit.More news: Drunk Japan Airlines pilot was 'almost 10 times over limit'
Coach Ernesto Valverde said on Friday he did not rule Messi out of playing against Inter, but said he was concerned about rushing the player back, especially as his side are on a winning run without their usual talisman. "Of course, it is necessary for Messi to recover". One is that he plays from the start, another that he comes on.
"I can't anticipate anything but what is clear is that we aren't going to take any chances with Messi".
The Catalans dispatched the Nerazzurri by a 2-0 score a fortnight ago and such a result would be enough for them to seal qualification into the knockout rounds with two matches to play.More news: Amazon offering free holiday shipping to everyone
If Barcelona win the match, they'll qualify from the group as winners.
"To already be in this situation in the fourth game of the group is great", Valverde added. "But we must credit Rayo Vallecano, they need points and were excellent, they brought the game to us and were very impressive".
"We have to give everything to win but we can't forget that they are favourites". We know we have to improve, but the important thing is the goal difference.More news: OnePlus 6T may soon come in a color that isn't black