The Hungary skipper has twice battled back from injury - the latest being a nine-month lay-off with knee ligament damage.
This is his second spell with West Brom and Gera said: "It's probably my best goal. It was special after being out for so long.
"The coach was great with me. He told me that I had no need to worry, just to work hard and show what I can do.
"West Brom is a special place for me. Even when I left, the supporters gave me a great reception and I want to repay them."