Billy Twelvetrees started all five of England's RBS 6 Nations games this year
Billy Twelvetrees' participation in England's summer tour to New Zealand has been plunged into doubt after Gloucester director of rugby Nigel Davies expressed his concerns over his ankle injury.
The 25-year-old, who started at centre in all five of England's RBS 6 Nations match this year, took a blow to his ankle injury as Gloucester secured a 38-30 win over London Irish.
The extent of the injury is due to be known soon but Gloucester director of rugby Davies did hint at a concern that the centre might be out for a significant period of time.
"We all know how committed Billy is as a player and for him to come off , especially in this game with a lot of emotion going on, says a lot but we will have to wait and see," said Davies.
"It's an ankle problem but with all of these things it's very difficult to give a formal assessment. We will monitor the situation over the next 48-hours and in that period we will have a scan to determine the amount of damage.
"It's not great for him but until we have a clearer picture we can't say how serious it is."
England flanker James Haskell insists he will be pushing as hard as possible to be back from a toe injury in time to make his case for a spot in Eddie Jones' side looking to defend their RBS 6 Nations title next year.
England Under-20s head coach Martin Haag was full of praise for his World Rugby Under-20 Championship-winning side after Harry Mallinder inspired them to a 45-21 win over their Irish counterparts and a third title in four years.