Lions flanker Lewis Moody faces a race against time to be fit for first Test contention against New Zealand next week.
The Leicester forward has withdrawn from his place on the bench for Wednesday's clash against Wellington, when he will be replaced by his England colleague Richard Hill.
The Lions confirmed Moody had suffered an injury to his left knee in training, but the apparent seriousness was not revealed until coach Gareth Jenkins spoke to the media in Wellington on Tuesday.
Jenkins revealed that Moody is "out of the selection process" for next Saturday's game against Otago in Dunedin, and that will seriously hamper his Test prospects, given the Lions boss Sir Clive Woodward is likely to have finalised his first choice line-up by early next week.
Moody has not travelled to Wellington, remaining behind at the squad's Christchurch base for further tests.
Three players - Lawrence Dallaglio, Malcolm O'Kelly and Simon Taylor - have already been ruled out of the tour because of injuries.
The possible loss of Moody would be a huge blow, given his versatility at blindside and openside flanker, but it would appear the signs are not good.
Prop Andrew Sheridan, meanwhile, is battling to overcome an ankle injury sustained against the New Zealand Maori last Saturday, raising doubts about his prospects of being fit to face Otago. Like Moody, Sheridan is a serious candidate for the Lions' Test 22.
The British and Irish Lions team to play Wellington on Wednesday is:
J Lewsey (Wasps and England); J Robinson (Sale and England), B O'Driscoll (Leinster and Ireland, capt), G Henson (Ospreys and Wales), G Thomas (Toulouse and Wales); J Wilkinson (Newcastle and England), D Peel (Lanelli and Wales); G Jenkins (Cardiff and Wales), S Byrne (Leinster and Ireland), J White (Leicester and England), D Grewcock (Bath and England), B Kay (Leicester and England), S Easterby (Llanelli and Ireland), N Back (Leicester and England), M Corry (Leicester and England).
Replacements: G Bulloch (Leeds and Scotland), M Stevens (Bath and England), P O'Connell (Munster and Ireland), R Hill (Saracens and England), C Cusiter (Borders and Scotland), S Jones (Clermont Auvergne and Wales), S Horgan (Leinster and Ireland)
After a good start, and dominating for long periods at the Ricoh, skipper Tom Savage spoke after the Wasps defeat to GRTV about the small things that Gloucester have to work on as well as focussing on some of the positives.
Gloucester Rugby will take on Wasps on Sunday in their first ever visit in the Aviva Premiership to the Ricoh Arena. Speaking to the local media today, Director of Rugby David Humphreys previewed the game as well as giving an update on the injured Henry Trinder.
Following the 48-10 Aviva Premiership win over London Welsh on Saturday, Dan Murphy praised his team mates for battling right up to the very last minute in difficult conditions and maintaining the momentum that the team have built in 2015.
Henry Purdy scored two memorable tries against London Welsh at Kingsholm on Saturday, and attributed the first one to hard work on the training ground before describing how much he's enjoying playing his rugby alongside friends like Callum Braley.
In a unique collaboration, the West's big three rugby rivals -Bristol Rugby, Bath Rugby and Gloucester Rugby - have joined forces to launch 'Break The Cycle' for 2015, and it's bigger and better than ever before.
Premiership Rugby today announces a new partnership with Singha Beer, which confirms the premium Thai lager as the new title sponsor of the Premiership Rugby 7s Series and an official partner of Premiership Rugby.