Messi collided with Benfica keeper Artur, before turning to shoot and immediately collapsing on the turn of the Camp Nou Stadium.

He was carried off on a stretcher and most feared he had suffered a serious knee injury, although tests later ruled that out. Speaking at a publicity act on Thursday, Messi said there was nothing serious in his knock, but admitted he had been worried when it had happened.

"I finished the move shooting at goal, because I thought it was going to be the last time I touched a ball in a long time," said Messi.

"When I went off on the stretcher, I feared the worst because of the pain. I thought I was going to be out of action for a long time. Now I feel OK, fortunately it was just a knock," he added.

Messi trained in the gym on Thursday and could play against Betis at the weekend, as he seeks to beat Gerd Muller's record of 85 goals in a year, at the moment he has 84.

"I am not certain if I will be there on Sunday, it depends on how it evolves," he said, unworried that his absence would be a problem to a side that has won 13 out of 14 games so far this season.

"The team will be the same with or without me. We have a lot of players," said Messi, who said Muller's record was not an obsession, although he admitted, "it would be nice to break it, as it has been there for such a long time."