Rangers boss Stuart McCall says he feels sorry for Gael Bigirimana, but admits he should never have been signed.
Chris Gunter will stay at Reading, after the club took up the option to extend his deal by another year.
The 32-year-old initially joined the Saints in 2010 on loan from Italian side Cesena, before that move was made permanent.
Do Prado has started just three league games in the last 12 months, and he has accepted that he will be departing St Mary's in the summer when his contract expires.
"I am going to miss Southampton if I have to go. I would be sad to go," said do Prado.