Ronald Koeman claims not even £100million would be enough to tempt Southampton to sell Sadio Mane - or any of their other stars - this January.
The 23-year-old has shone in the 15 months since swapping Red Bull Salzburg for Saints in a £10million deal.
It led to strong interest from Manchester United in the summer and Press Association Sport understands the likes of Bayern Munich and Paris Saint Germain are amongst the high-profile clubs monitoring Mane.
However, Saints boss Koeman says there is no chance that the Senegal winger, or anyone else, will be leaving when the transfer window re-opens.
"No, no, not in January," he said. "Already we spoke about that situation and we sell nobody in January. Nobody, even when they pay £100million."
Meanwhile, Saints have secured the future of highly-rated Josh Sims until 2018.
The Saints academy graduate was part of the triumphant England side at last year's European Under-17 Championship.
Manchester United, Chelsea and Liverpool have been linked with Sims in the past, but the 18-year-old has now signed a new two-and-a-half-year deal at St Mary's.