Former England fly-half Danny Cipriani was taken to hospital after being hit by a bus, his club, Sale Sharks, said on Thursday.
The Premiership side said the 25-year-old suffered concussion and underwent X-rays after the incident on Wednesday evening and was kept in overnight.
No further information was released but British media reported that the player was on a night out with team-mates in the northern city of Leeds when he was hit.
The Daily Telegraph newspaper said Sale players were on an "end-of-season pub crawl" at the time and Cipriani was in fancy dress costume.
The BBC sport website said it was thought that Cipriani was struck as he ran across the road and misjudged the speed of the bus.
Cipriani, who previously played for Wasps and Melbourne Rebels, joined Sale on a three-year deal in February. His club and international career have been dogged by controversy, particularly over disciplinary problems.
He made his England debut under Brian Ashton in March 2008 but has not played for his country since 2009, after falling out of favour with Ashton's successor Martin Johnson, while current coach Stuart Lancaster has also overlooked the fly-half.
Sale, who have fought relegation for much of the season but are now safe, have one match left this season, against Wasps on May 4.