Albion have triggered a break clause in defender Diego Lugano's contract and decided against taking up their one-year option on midfielder Scott Allan.
Finally, it confirmed that five loan signings - Scott Sinclair (from Manchester City), Morgan Amalfitano (Marseille), Matej Vydra (Udinese), Thievy Bifouma (Espanyol) and Goran Popov (Dynamo Kiev) - have all returned to their parent clubs.
WBA chief Richard Garlick said: "Zoltan and Steven have been terrific professionals during their many years with us. They have been a real credit to the football club, both on and off the field.
"We know that Zoltan is looking to find another club while Steven, who is keen to carry on playing but is also doing his coaching badges, is considering his options.
"Liam has made a key contribution during the past two and a half years, which we thank him for. He has been a popular member of the dressing room and we wish him well as he looks for a new club.
"I would also like to thank Diego and our five loan signings for their efforts over the past 12 months.
"Scott Allan has found it difficult to break into the first team since arriving two and a half years ago and we wish him well in his future career."
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