The Hungary international rejoined The Hawthorns club from Fulham in the summer, but had to wait to make his second debut for the Midlands outfit due to an ankle knock.
The 32-year-old has played in the Baggies’ last three fixtures, but was replaced in the first half of the defeat to Harry Redknapp’s men at the weekend.
Despite hoping that the ailment would only mean a minor layoff, boss Roy Hodgson has clarified that the knock will see Gera on the treatment table for a considerable amount of time.
“Zoltan has done really well since coming into the team three games ago and his performances quickly justified how highly we rate him,” Hodgson told the club’s official website.
“We still don’t know for sure how long he will be out for but we know we won’t be able to call on his services for the foreseeable future.
“This will be a major blow both on the training pitch and the match arena.
“Zoltan is now in the hands of our excellent medical and sports science department and we just have to hope and pray that his stint on the sidelines is not an overly prolonged one,” he concluded.
West Brom sit in 14th in the Premier League table currently, and travel to take on QPR next weekend.
By Gareth McKnight