Sinclair left Manchester City for Albion last week.
"The (2014) World Cup is coming up and the manager has been putting the likes of (Andros) Townsend and (Ross) Barkley in the team," said Sinclair.
"If they're getting a chance, then I don't see why I can't, if I'm playing well.
"I was so frustrated at not playing and I just wanted to get out and play week in and week out and be happy."
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