Jamie Overton will join Surrey on loan for the rest of the 2020 domestic season.
Overton, who has already agreed a three-year deal to join Surrey from Somerset at the end of the current season, will now play for Surrey throughout September.
He will be available for all South Group matches in the Vitality Blast and Surrey's one remaining Bob Willis Trophy fixture against Sussex, starting on Sunday.
Surrey Director of Cricket Alec Stewart thanked his Somerset counterpart, Andy Hurry, and the club for releasing Overton. "I'm looking forward to seeing Jamie play and perform in a Surrey shirt," Stewart said.
Overton, who went on loan to Northamptonshire last season, has struggled to gain opportunities in Somerset's first-choice attack, with twin brother Craig, Lewis Gregory and Josh Davey all ahead of him in the County Championship pecking order in recent times. Somerset have also boosted their seam-bowling stocks by adding Jack Brooks and Vernon Philander, although the latter's deal was cancelled due to the Covid-19 pandemic.
While Surrey have several seamers on their books, they are regularly without the Curran brothers due to international duties.
Part of England's 30-man training group ahead of the West Indies Test series, Overton has been in impressive form with bat and ball for Somerset in the Bob Willis Trophy.
He claimed a five-wicket haul - and seven wickets for the match - against Glamorgan before scoring 68 and taking 4 for 26 among five wickets for the match against Northamptonshire. He then scored a maiden first class century with his 120 in Somerset's draw with Warwickshire.
Hurry said: "Jamie has requested an immediate loan move after recently agreeing a contract with Surrey CCC for next season and beyond and we have agreed to this request. I want to take this opportunity to thank Jamie for all his contributions and commitment to the club over the last 10 years and we wish him well in the next chapter of his career."