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The Leicester forward has withdrawn from his place on the bench for Wednesday's clash against Wellington, when he will be replaced by his England colleague Richard Hill.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)
Speaking to GRTV after the 40-29 Aviva A League win over Wasps Rugby, Academy Coach Rich Whiffin explained his pride in the squad to overcome a strong opponent and book their spot in next week's Aviva A League final.
Willi Heinz returned from injury to skipper Gloucester to a famous 16-14 win over Stade Rochelais on Saturday evening. Speaking after the game in France, Heinz admitted the win wasn't pretty but was full of courage and a great result for the club.
Billy Burns contributed all Gloucester's points in the 16-14 European Rugby Challenge Cup win in La Rochelle on Saturday evening, but dedicated the victory to the whole squad whilst also praising the travelling support.
Speaking after Gloucester's brave 16-14 win against Stade Rochelais which clinches a European Rugby Challenge Cup final spot, Director of Rugby David Humphreys paid tribute to the way the team had executed the game plan in a hostile environment against quality opposition.
Greig Laidlaw returns to the Gloucester Rugby squad this week, and his inclusion is an important one after a serious ankle injury. The Scottish scrum half is determined to drive the team forward in their European Rugby Challenge Cup semi final in La Rochelle this Saturday.
Gloucester take on La Rochelle in the European Rugby Challenge Cup semi-final in France on Saturday evening, with the Top 14 side the favourites in the eyes of the bookmakers. However, David Humphreys is looking for his side to rise to the occasion against a familiar opponent.
Speaking to GRTV after Saturday's 39-30 Aviva Premiership win over Sale, Mark Atkinson admitted that the performance wasn't perfect but that the team's character shone through in a game that could easily have slipped away.
Scotland scrum-half Greig Laidlaw is targeting a 'unique' finish to his Gloucester tenure in the European Rugby Challenge Cup final at the venue where his professional playing career began, BT Murrayfield Stadium (Friday 12 May).