West Bromwich Albion have accepted a bid from Aston Villa for defender James Chester, Press Association Sport reports.
Wales international Chester, 27, is now set to hold talks with relegated Villa and could move in the next few days.
Villa have lost their opening two games this season -- including an embarrassing 3-1 EFL Cup defeat to Luton on Wednesday -- and boss Roberto Di Matteo confirmed he needs defensive reinforcements.
Ciaran Clark joined Newcastle for £5 million and Joleon Lescott is unlikely to have a future under Di Matteo following relegation from the Premier League last season.
Chester has struggled for first-team opportunities at The Hawthorns since joining from Hull City for £8m last summer.
He made just nine league starts, was often played out of position and may again be behind Jonas Olsson, Jonny Evans and Gareth McAuley in the pecking order for West Brom.
Chester impressed during Wales' march to the Euro 2016 semifinals in the summer and made the most challenges and interceptions of any players in the tournament with 36.
Villa have already spent £12m on Ross McCormack as they seek to secure promotion at the first attempt but the striker was withdrawn in the second half in their defeat at Kenilworth Road and is yet to score.