Kent are set to ring the changes for the crucial NatWest T20 Blast trip to Surrey on Wednesday night.

After four games without a win in South Group, Spitfires have slipped to sixth, three points adrift of third-placed Surrey, who also have a game in hand before Wednesday night's game, which is televised on Sky Sports 2 (6.30pm).

Head coach Jimmy Adams said: "We’ve had a few games recently where we haven’t quite made it over the line. The tie with Glamorgan and (Friday's last-ball) loss to Gloucestershire were disappointing.

"To make the playoffs we need to beat Surrey, who have been in great form, so it’s as straightforward as that."

With five games to come after the trip to the Oval, Kent need a return to winning ways but will be without key bowlers Doug Bollinger (shoulder) and David Griffiths.

Assistant coach Matt Walker said: "Griff looks to have suffered a nasty hamstring tear and, while we haven't had the results of the scan back yet, it looks like being at least six weeks out for him.

"It's a big blow for him and us as he's done really well in this form of cricket.

"Doug is resting his shoulder, he's played an awful lot of cricket, but with the pitch at the Oval it might be that playing two spinners might be an option we consider. We'll have to wait and see the track."

Batsman Ben Harmison has been drafted into the squad while Charlie Hartley could be considered as a replacement paceman.

Kent squad: Rob Key, Adam Ball, Daniel Bell-Drummond, Sam Billings, Alex Blake, Mitch Claydon, Fabian Cowdrey, Charlie Hartley, Ben Harmison, Sam Northeast, Adam Riley, Darren Stevens, James Tredwell.