Ryan Jones suffered a head injury early on against United States
Lions team manager Gerald Davies says events leading to Ryan Jones' exit from the Lions tour need to be clarified.
Jones suffered a head injury against United States on Saturday but on Monday Wales caretaker coach Robin McBryde declared the 28-year-old fit.
Jones joined the Lions on Thursday and on Friday he was ruled out.
Welsh Rugby Union board member Davies said: "It would be easy to fall into the blame game....but I think there are matters that need to be sorted out."
At Monday's post-north America tour press conference McBryde said: "I think Ryan's alright. I don't think there's any major problems there really."
In the wake of the Lions announcement of Jones' rapid return from the tour, a WRU spokesman said: "Ryan Jones was initially examined by the Wales squad medical team in the USA and was passed fit to travel home to the UK.
"A full medical examination of the player was due to take place in the UK late this week, but the routine tests were then scheduled for South Africa when he flew out."
Jones flew out on Wednesday, arriving with the Lions in Cape Town the following day.
A Lions statement read: "Jones underwent the same routine medical testing as all replacement players joining the tour and it led to the team's medical staff requesting a further examination by an independent neurosurgeon.
"This was due to a concern over the player's recent medical history that included two significant knocks to the head while playing for his country on their recent tour to North America.
"On the advice of the neurosurgeon, it was determined that it was not safe for Jones to undertake any physical contact for a mandatory three weeks."
Davies later told Radio Five Live: "It's hugely regrettable that he should have travelled all this way and then return as soon as he had arrived.
"But I think we need to clarify exactly what happened before he came out here and I think there will have been a lack of communication somewhere along the line which I wouldn't like to comment [about] further at the moment until we see further into the issue."
It's hugely regrettable that he should have travelled all this way and then return as soon as he had arrived
Ex-Wales second row Derwyn Jones gave his reaction to BBC Sport Wales' The Back Page.
Derwyn Jones said: "I am surprised that the scan was not done on his head after the game [v USA]. It was a hell of a tackle by the Americans on him.
"He came off very soon after the impact and for his own safety, really, I felt that he would have needed a scan pretty quickly after the injury."
Ex-Wales back-row forward Emyr Lewis agreed with Derwyn Jones' sentiments.
Lewis said: "When it comes to head injuries you've got to be extra careful and as Derwyn mentioned, in hindsight I'm sure that the Welsh management wished that they'd taken him to hospital and had the tests done.
"But rugby players these days take knocks on the head mostly every game and I know it's difficult to decide which ones merit going to hospital and which ones don't."
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