Dorrans suffered the injury in the game against Sunderland
West Brom's Graham Dorrans has been playing with a broken metatarsal for the last three weeks after an initial X-ray failed to pick the injury up.
The Scot suffered the injury during the 3-0 win over Sunderland on 25 April.
The midfielder, 22, missed the Baggies' 1-0 defeat at Tottenham the following weekend, but played for 55 minutes in the 3-1 win over Wigan last Saturday.
"Last week's X-ray showed nothing, yet this week's X-ray shows a broken metatarsal," said boss Tony Mowbray.
Dorrans agreed a three-year deal with a further year's option in the club's favour last week.
The injury rules the Dorrans out of West Brom's final two Premier League games of the season.
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