The 26-year-old Nigerian joins Greek side Olympiakos after just a year with the Baggies.
Leicester City are in talks with Sporting Lisbon over a possible deal for right winger Andre Carrillo, according to Sky sources.
Striker Glenn Murray will have a medical at Bournemouth on Tuesday after they agreed a £5m fee with Crystal Palace.
Stoke City forward Jonathan Walters has handed in a transfer request, according to Sky sources.
Sunderland forward Emanuele Giaccherini returns to Italy to join Bologna on loan for the rest of the season.
Manchester City defender Jason Denayer has joined Turkish club Galatasaray on a season-long loan.
Bournemouth have agreed a £5m fee with Crystal Palace to sign striker Glenn Murray, according to Sky sources.
BBC Wales football correspondent Rob Phillips outlines what Wales need to do this week to qualify for Euro 2016.