The Baggies look to have won the race for the former Swansea man, seeing off late competition from Everton for his signature.
Sinclair has been a peripheral figure at the Etihad, since completing his move from South Wales for £5.2million last summer.
Despite an impressive opening Premier League campaign with the Swans, which was followed up by some good performances for Team GB in the 2012 Olympic games, Sinclair managed just 11 appearances in all competitions last season.
He is now due to hold talks with Baggies manager Steve Clarke, and chairman Jeremy Pearce over a switch to the Midlands, after Manchester City accepted the club’s offer of a season long loan.
The move is set to provide Sinclair with his seventh loan spell of his career, having previously had stints at Plymouth, QPR, Charlton, Crystal Palace, Birmingham City and Wigan.
The forward is looking forward to a fresh challenge this season, having recently tweeted:
“A fresh start of new things to come!
“Hoping to get more of a chance this season than last!! Only time will tell.”
Sinclair is set to become West Brom’s second attacking signing of the summer, after the club secured the services of veteran French forward Nicolas Anelka earlier in the transfer window.
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