The Bulgarian was commenting on his former club Celtic.
The 20-year-old Tottenham Hotspur academy graduate has signed a new contract until 2021.
The 18-year-old wonderkid is also wanted by Manchester United.
Newcastle United are most people's favourites to gain promotion to the Premier League.
The Northern Irishman performed well after being brought back into the Leeds team.
The USA international was not pleased when club icon Petrov did not get a new deal at Aston Villa.
The 23-year-old has come in for criticism once again this season.
Glasgow Rangers midfielder Joey Barton was recently involved in a training ground bust-up at the Gers.
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The 28-year-old scored in a recent 4-0 win at Molineux.