The former Newcastle and Rangers forward took to Twitter on Saturday afternoon.
The Tottenham head coach has been discussing the 23-year-old Dane.
The Black Cats are keen on the Romanian leaving the club.
The Dane has been struggling for form recently but was excellent v Sunderland.
Leigh Griffiths guided Celtic to a win against Dundee United away from home in the Scottish Premiership on Friday evening.
Liverpool host Manchester United on Sunday in a key battle for the top four.
The striker has finally found his feet in Yorkshire.
Sunderland’s Emanuele Giaccherini looks set to leave the club permanently.
The Italian was poor in the Championship's early fixture.
Rangers will face Livingston at Ibrox in the Scottish Championship this afternoon…
Regulations surrounding bankers' pay, particularly the EU bonus cap, have lead to fixed salaries representing a higher proportion of total pay packets, meaning financial institutions are less capable of reacting to a downturn, the Bank of England has warned.
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Aaron Ramsey featured in central midfield in the win over Aston Villa.