HITC Sport understands Bristol City have moved for the in-demand Gillingham star.
Rhoys Wiggins has struggled for appearances so far at Sheffield Wednesday.
Sunderland are in the midst of a relegation battle.
The former Bordeaux midfielder completed a £4.5m move to the Magpies earlier in the month.
Rangers have retained the services of Zelalem until the end of the season.
Emre Can currently plays for Liverpool, while Dele Alli is on the books of Tottenham Hotspur at the moment.
The Republic of Ireland winger looks destined to leave Goodison Park this month.
The Reds were beaten 1-0 by Manchester United on Sunday.
Aston Villa are currently being linked with Hajduk Split stopper Lovre Kalinic.
Derby County defender Stephen Warnock says that he can carry on playing for a few more years.