Birmingham City have handed new one-year contracts to captain Paul Robinson and midfielder Olly Lee.
Defender Robinson, 35, made 46 appearances in 2013-14, while 22-year-old Lee featured 22 times.
Blues remain in talks with the representatives of winger Chris Burke and striker Nikola Zigic.
Wade Elliott, Peter Lovenkrands, Hayden Mullins, Brian Howard, Aaron Martin and Darren Ambrose have all been officially released by the Championship club.
Former Denmark international Lovenkrands, 34, joined Birmingham from Newcastle in 2012. The majority of the forward's 17 appearances this season came from the bench, while Howard, 30, arrived in January on a free transfer, scoring one goal in five games.
Defender Martin, 24, joined from Southampton in January, featuring eight times.
Blues also confirmed the departure of Ambrose, 30, who spent the second half of the season on loan at Greek Super League side Apollon Smyrni.