The Stoke City midfielder has been in fine form for the Potters this season.
The Sky Sports pundit believes the Bournemouth loanee should move on this summer.
The Whites beat Wolves on Saturday thanks to a second-half winner credited to Roofe.
Released from Ibrox by Mark Warburton in the summer, the Rangers old boy is hoping they can get a big win.
Sullivan claimed last summer that Austin had "no ligaments in his knee".
Stoke City secured back-to-back Premier League victories after a comfortable 2-0 defeat over Hull City.
Newcastle United beat Ipswich Town 3-0 to stay top of the Championship
Warburton is preparing his Glasgow Rangers side for the Old Firm Scottish League Cup semi-final on Sunday.
Tottenham Hotspur drew 0-0 at Bournemouth today.
Aston Villa defeated Fulham 1-0 in the Championship earlier today.
The Toffees have had to dig into their pockets to pay-off their former boss.
The champions travel to Merseyside this weekend, and these individual match-ups will go a long way to deciding the outcome.
When Russell Slade took over as Charlton manager this summer, he knew that there was quite a job to do.