There's no guarantee Gary Hooper will be staying with Celtic this summer.

The prolific striker is a target for Southampton.

And the Scottish Sun says Hooper is unhappy that he is currently earning up to £15,000 a week LESS than fellow key men such as Joe Ledley and captain Scott Brown.

Hooper is content at Parkhead - but he's also fully aware he could easily TREBLE his money elsewhere, with Premiership new boys Southampton among the clubs chasing him.