NOTTINGHAM: Inida fast bowler Zaheer Khan has been ruled out of today's second Test against England at Trent Bridge with a hamstring injury.Left-arm quick Zaheer broke down in the first Test at Lord's, which India lost by 196 runs, after taking two for 18 runs in 13.3 first innings overs and didn't bowl again in the match.The 32-year-old was instrumental in India's seven-wicket win in the corresponding Trent Bridge Test against England four years ago, taking nine for 134 runs in the match.Now his place is set to go to either fast bowler Shanthakumaran Sreesanth or seamer Munaf Patel.Wicketkeeper-batsman Dhoni, who refused to divulge the identity of Zaheer's replacement at Trent Bridge, said he hoped India's spearhead would be fit in time for the third Test, starting at Edgbaston on August 10.India also have a doubt over opening batsman Gautam Gambhir, who suffered an elbow injury when hit fielding at short leg at Lord's.If he were ruled out Rahul Dravid, as happened in the second innings at Lord's, would be promoted to open the innings with Yuvraj Singh in line to take Gambhir's place in the team.Meanwhile, Steven Finn has been called up to England's squad because of injury doubts over fellow pace bowler Chris Tremlett.Tremlett tested his hamstring 'niggle' for a second time in England's net session and captain Andrew Strauss is optimistic he will play