Birmingham have offered new contracts to four players as they continue talks with goalkeeper Darren Randolph.
Wolves' Bakary Sako has revealed he is mulling over offers from the Premier League but is yet to decide on his future.
Vitesse Arnhem have terminated the contract of Jonathan Reis in order to allow the striker to return to his native Brazil with his family.
The 24-year-old has been in Holland since 2007 when he joined PSV Eindhoven before he moved on to Vitesse in 2011.
Vitesse returned to the top of the Eredivisie on Sunday with a 3-0 win at Go Ahead Eagles but it seems their lofty position is not enough to persuade Reis to stay at the GelreDome.
While his contract was due to run until June 30 2016, it will now end on December 1 with a mutually amicable parting of the ways.
Technical director Mohammed Allach told the club's official website: "In Brazil he can make a new start and hopefully approach his former level.
"We wish Jonathan all the best, both privately and in his future football career.
"Now we say goodbye to the footballer Jonathan Reis but for the person the door is always open in Arnhem for Jonathan."
Reis in turn said: "The main reason for my early departure from Vitesse is that I want to return to Brazil with my family, I have also seen there were more sporting opportunities to play in the first team there.
"I look with a good feeling back on my time with Vitesse.
"This club gave me the confidence after my serious injury and rehabilitation period.
"Unfortunately I can not do as I wanted.
"Now comes my way back to Brazil and that is good. I wish Vitesse good luck."