Gibbs was at West Brom on Tuesday evening to undergo a medical and put the final touches on a deal worth up to £7 million, sources said.

The move ends a 13-year spell at Arsenal for Gibbs, who joined Arsenal's academy in 2004 as a teenager and was quickly converted from a winger to a left-back.

However, he had been widely expected to leave after spending the last couple of seasons as a backup to Nacho Monreal and seeing new signing Sead Kolasinac join the Gunners this summer.

Arsenal had agreed a fee with Watford this weekend but Gibbs turned down the London club's offer and opted to join Tony Pulis' West Brom instead.

Meanwhile, Arsenal are pursuing West Brom centre-back Jonny Evans, though Manchester City remain favourites for his signature.

West Brom are also closing in on a move for Paris Saint-Germain's Grzegorz Krychowiak, sources close to the player said.

The Poland international only moved to PSG from Sevilla last year, but he has been made available as the French club look to balance their books after the €222 million arrival of Neymar.

West Brom have been searching for a defensive midfielder all summer and they could now pull off a coup by bringing in Krychowiak, who has struggled to establish himself and has yet to feature for PSG so far this season.

A number of clubs have expressed an interest in Krychowiak, but West Brom are in pole position that secure his signature, sources said.

West Brom have so far only signed Ahmed Hegazi, Oliver Burke, Jay Rodriguez and Gareth Barry this summer, and Krychowiak could be the next new face in at the Hawthorns.