The Nigerian striker had a torrid time during his short stay at the Ibrox Stadium and claimed the Scottish side still owe him a month salary
Sadiq Umar has slammed Rangers boss Steven Gerrard and the Light Blues for poor treatment during his time with the side.
The 22-year-old moved to the Scottish Premiership outfit on a season-long loan deal from Italian Serie A side AS Roma last summer.
The forward endured a torrid time with the Ibrox Stadium outfit as he was limited to 16 appearances in all competitions, starting only one game [in the League Cup semi-final against Aberdeen] and after six-month stay, his contract was cut short.