Marc-Antoine Fortune has returned to West Brom after ending a largely unhappy stay at Celtic Park on a low.
Fortune has signed a two-year contract at the Hawthorns.
He flew straight to the Midlands from Holland after playing in Celtic's 4-0 Europa League play-off defeat by Utrecht.
The 29-year-old enjoyed a happier spell in his career when he played for West Brom on loan from Nancy during their previous spell in the Barclays Premier League.
The French-Guyana forward has been registered in time to play in Sunday's clash at Liverpool, subject to international clearance.
The former Nancy striker netted five goals for the Baggies in a four-month loan stint in 2009 before being reunited with Tony Mowbray after the manager moved to Celtic Park.
Fortune struggled to live up to his £3.8million price tag, although he was not helped by a knee injury early in his Parkhead career, and failed to win a trophy.
He netted 12 goals in 43 matches and began to win fans over with his all-round play but he has become the latest victim of Neil Lennon's rebuilding job as the Celtic manager eyes a move for Hibernian striker Anthony Stokes.
However, West Brom manager Roberto Di Matteo is delighted to welcome the frontman back to Albion, with the club holding a year's option on top of his initial contract.
Di Matteo told the club's official website: "I'm delighted to welcome Marco back to the club.
"The great thing about this signing is that it won't take him long to settle in because he knows the club inside out. He also knows what this league is all about.
"Marco got on really well with the other players during his loan here and they're all delighted to see him back.
"He is a powerful striker who can hold the ball up and bring others into play and having also signed Peter Odemwingie last week, we now have plenty of competition up front."
Fortune joins former Lokomotiv Moscow forward Odemwingie, who hit the winner against Sunderland last weekend, in signing for the club this summer alongside Boaz Myhill, Nicky Shorey, Gabriel Tamas, Somen Tchoyi, Pablo Ibanez and Steven Reid.