Odemwingie has followed up the statement he issued on Friday night by claiming he wants to leave because the Baggies had previously doubted his commitment.
The Nigeria international is a target for QPR and on Friday had a transfer request rejected by Albion. Rangers have already had a £2million bid turned down but sources close to West Brom expect them to make another offer before the transfer window closes on Thursday.
Odemwingie has come under fire from some Albion fans after making clear his desire to leave.
He tweeted: "I can understand the reaction of few Albion fans on my desire to leave the club. Real reason? Cos they once doubted my commitment.
"Want to know why I wanted to quit top flight football last summer earlier than I wished to? They know at the club.
"Albion fans are not the only reason, but made it easier for me to decide to stay and try my best to forget about the disappointment.
"I succeeded in doing that. But it's not getting better.Before bigger disappointment comes one day, I better leave on a good note."
Odemwingie admits his agent advised him not to make the Twitter outburst.
He added: "I am crazy haha adviser text saying don't tweet, it weakens our position. Doesn't weaken nothing ! When I want to do something, I Do it."