Ospreys fly-half Dan Biggar will have more test following his "dazed" memory loss in Saturday's PRO12 loss to Leinster.
Wales international Dan Biggar is having concussion tests after initially passing a pitch-side examination during Saturday's 20-18 PRO12 defeat to Leinster.
Biggar missed a last-minute penalty in the game at the Principality Stadium after being absent from the field for 10 minutes in the 59th minute following a clash of heads.
The 27 year old had undergone the standard pitch-side head injury assessment and was cleared to return to play.
But, In an interview after the game on Saturday, Biggar said: "I can't really remember much of the last 10 minutes, to be honest. I was a little bit dazed."
Ospreys say the Wales international must now pass return-to-play protocols before playing again.
Ospreys have said, “Dan Biggar left the field during the second half match to receive medical treatment for an eye wound. Before being allowed to return to the field Dan underwent, and passed, a head injury assessment as per the required protocol and satisfied the medical team that he was fit to continue.
“Having resumed playing, Dan reported no further symptoms and his actions caused no undue concern for the medical team at that time.
“After the match Dan underwent a thorough assessment with the medical team, as is standard procedure for such occurrences, at which time they were made aware of his comments in a television interview immediately after the final whistle.
“Dan will continue to be monitored as part of the HIA protocol in case of any delayed reaction. He will need to pass each stage and satisfy stringent criteria before being ruled fit to play.
“The medical welfare and wellbeing of players is the utmost priority of everybody involved at the Ospreys at all times.”