The Belgian international has also been watched by Manchester City and Arsenal recently.
The Viola are keen to bring in the 21-year-old should they lose Adrian Mutu at the end of the season.
Mutu has been strongly linked with Roma recently.
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Newcastle keen on Stuttgart striker
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Arsenal to let Newcastle and Chelsea target leave
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Crouch with predictions ahead of Newcastle v Arsenal clash
Former Liverpool and England forward Peter Crouch has made his prediction for the clash between Newcastle and Arsenal on Saturday evening.
Crouch with predictions ahead of Liverpool v Everton clash
Former Liverpool and Tottenham forward Peter Crouch has made his prediction for the clash between his two former clubs on Saturday evening.