The incident occurred in the warm-up before the last-16 first leg tie but Ronaldo showed no ill effects during United's 1-1 draw in France.

"We reported the matter to Uefa before the game," said Manchester United manager Sir Alex Ferguson.

"We noticed it in the warm-up and they (Uefa) are aware of it."

606: DEBATE We looked far better when Nani and Tevez came on. Still, 1-1 away is good enoughKB

onaldo was back in the team after a virus and had a quiet game by his standards, according to the BBC's Conor McNamara.

"Manchester United complained to Uefa before kick-off and they (Uefa) may now check TV footage for evidence of repeated use of laser pens during the game itself," said McNamara.

Carlos Tevez's late goal ensured United head to Old Trafford on level terms after Karim Benzema had given the hosts the lead.

United were stunned after the break when the 20-year-old striker turned on the edge of the area and fired a rasping drive into Edwin van der Sar's left corner for his 24th goal of the season.

Late in the game, however, Ronaldo had a vicious free-kick tipped over the bar and Tevez struck after Lyon made a hash of the resulting corner.