The in-demand 25-year-old recently revealed that he had agreed terms with four Premier League clubs - Sunderland, Blackburn, Fulham and Tottenham Hotspur - adding that he was less hopeful of securing his dream move to Arsenal.
And although Bordeaux president Jean Louis Triaud previously ridiculed the idea of their prize asset joining the North East outfit, Black Cats' boss Steve Bruce is now believed to be closing in on the signing of the Moroccan front-man, who has netted 15 goals for his country.
However, les Girondins, who won their first French title in 10 years last season partly thanks to Chamakh's 13 league goals, remain keen on keeping hold of their star striker.
And former Manchester United and Inter Milan defender Blanc has insisted that the front-man will only be allowed to leave for a bigger club.
"I can understand Marouane wanting to leave, even him wanting to go at any cost, but he must go to a club which merits him," he said.
"If this is not the case I might refuse his departure.
"If it does not work out he can stay at Bordeaux, it would not be a jail sentence to stay for another year after which he could have the promise of going elsewhere."
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