And reports in Germany today suggested United had not given up hope.
But Rummenigge has hit back and told United to look elsewhere.
He said: "Muller is not for sale. Our English colleagues seem to be unable to spend all of their money."
GETTY
Thomas Muller is staying at Bayern Munich
Muller worked under Van Gaal in his time in Bavaria and has maintained a strong relationship with the Dutchman.
But the World Cup winner appears happy to stay in Germany.
United have already managed to secure the signing of Bastian Schweinsteiger from Munich in a £14m deal, however any lingering hope to secure Muller appears over.
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