Martial is widely expected to leave Old Trafford before next week's deadline, and the Frenchman has been discussed in a possible swap deal with Bayern centre-back Jerome Boateng in various reports.
Rummenigge, however, has insisted that Bayern are not looking to sign another winger this summer.
"We have four wingers: Franck Ribery, Arjen Robben, Kingsley Coman and Serge Gnabry," Rummenigge told Bild. "And Alphonso Davies will also join in January. You must not overdo it, like some clubs do, or you create a problem for the coach."
Martial scored 11 times and registered nine assists for United last term, but the 22-year-old's relationship with Red Devils boss Jose Mourinho has deteriorated further this summer.