"I am not sure if he is out for the season but we have to decide whether he needs to eventually go in and have a look or whether the knee responds to rest," said Mowbray.
Barnett arrived at the Hawthorns in the summer of 2007 in a £2.5m move from Luton and, although he featured heavily in the side's successful Championship promotion push, he has struggled for both starts and form this term.
He has made 11 Premier League appearances and was memorably at fault for the opener in the 3-2 defeat to fellow strugglers Newcastle in February when his mistake allowed Damien Duff to score.
With Abdoulaye Meite also ruled out for Saturday's meeting with Bolton, the partnership of Shelton Martis and Jonas Olsson may be given a chance to repeat a solid display that earned a clean sheet against West Ham this week.
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