Ankle and knee injuries sustained on international duty in November have hindered his progress this term but an impressive debut campaign last time around appears to have won Coman enough capital in Bavaria.
"At the moment we have a tendency to meet the option," Rummenigge told Fussball Bild.
"We will have our time to decide this. In principal, we are completely convinced of the player.
"But we also have to state that last season was better than this season, whereas he had some injury problems [this season]."
Another young talent reportedly of interest to Bayern is Werder Bremen midfielder Serge Gnabry.
The 23-year-old has impressed with seven goals in 15 appearances since moving to the Bundesliga from Arsenal last August and marked his breakthrough into Joachim Low's Germany set-up with a hat-trick versus minnows San Marino in World Cup qualifying.
However, new contracts for Arjen Robben and Franck Ribery, along with the presence of Douglas Costa and Coman, means Rummenigge feels Bayern are well-stocked in the wide areas.
"Gnabry is a player of Werder Bremen and I do not want to make any problems with our colleagues in Bremen," he added.
"Of course we will always watch German national players, but if we do something else, I do not know.
"We are covered on the wings, with Ribery, Costa and probably Coman as far as next season is concerned."