Chris Wood, the Hampshire left-arm seamer, has been ruled out for the rest of the season after suffering a more significant knee injury than first thought.Wood picked up the injury during the County Championship match against Middlesex at the Ageas Bowl and subsequent investigations showed that he required surgery, which he underwent last week.Wood’s absence will be a blow for Hampshire’s NatWest T20 Blast campaign as he had become a key figure in that format.Hampshire have suffered a string of injuries to their bowling attack early in the season. They brought in Tino Best to bolster their resources and also signed Gareth Andrew on a match-by-match basis. However, they have Shahid Afridi and Darren Sammy – the latter arriving in June – signed up for the T20 Blast.Sean Ervine was on Wednesday named Hampshire’s limited-overs captain after James Vince’s call-up to England’s Test side.