The Paris Saint-Germain coach is prepared to lose the 30-year-old for free in the summer after stressing he will not be allowed to move this month
The attacker will be a free agent when his contract expires at the end of June, but he has long been linked with a move away from the French champions, having lost out on a regular starting spot.
The former Napoli player's agent says a return to Italy is the preferred destination for the 30-year-old, who joined PSG for around €30 million in 2012, but the coach insists he will have to wait a few more months before he can make his move.
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"We have been very clear with Lavezzi. We have been very, very clear with him," Blanc said.
"I don’t want to tell you what we said but we have been very clear with him, from the beginning of the season until this transfer window.
"We have been very clear on his situation. He cannot say the contrary. We all know that if someone wants to leave the club, all parts of the club must agree. Apparently, that is not the case because he hasn't moved.
"His contract ends in June and there is a strategy. Well, not really a strategy, but there is a position to stand, hold or keep.
"We have had discussions with players at the end of their contracts. We spoke with them and we told them that we could adapt to their positions if we found satisfaction."
PSG currently sit 21 points clear of second-placed Monaco in the Ligue 1 standings, while still competing in the Coupe de la Ligue, Coupe de France and Champions League.
The capital club take on Chelsea when the latter resumes in February, and the coach says his team are in for a tough tie.
"To be competitive the D-day against Chelsea, we’ll have to give it all we have in Ligue 1 and in the cup. Yes, there are some risks to give it all we have but you always have risks," he said.
"If you begin to think about injuries, about not giving 100 per cent in some duels, it’s the best way to get injured or to not being present on the big day. I said that to my players. So, yes there are risks. But there are always risks. Zero risk doesn’t exist.
"I think that we have lots of games, maybe too many, before Chelsea - I would have loved to play a bit less. We’ll play them all but we can't be focused on this game because it’s the best way to get into trouble."