Celtic claim a fee was agreed with Manchester City for John Guidetti prior to them taking the striker on loan.
Xabi Alonso claims no Premier League offers were put to him before leaving Real Madrid for Bayern Munich.
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.