Port Vale defenders Clayton McDonald and Phil Roe have signed extended contracts, but Rob Kozluk has been told he is free to leave the club.
McDonald and Roe joined Vale in the summer after being released by Walsall and Sheffield United respectively, and will now stay with the League Two side until the end of the season.
Defender McDonald has made 18 appearances for Micky Adams' side, while young stopper Roe has featured just once as a substitute in the FA Cup.
Meanwhile, Vale boss Adams has confirmed that Kozluk can go after the veteran defender made seven appearances following his arrival in September.
"I would like to thank Rob for his efforts over the last three months," Adams told the club's official website.
"He has been an excellent professional, who has been a great example to the club's younger players.
"Both on and off the pitch, Kozzy has been a terrific character to have around the place; however, with Adam Yates' return to the side, his first-team opportunities have been limited."