Bayern Munich buying Leroy Sane would be a boost to the Bundesliga, according to Borussia Dortmund chief executive Hans-Joachim Watzke.
Manchester City winger Sane has been heavily linked with a switch to Bayern, who are seeking to improve their wide options due to the imminent departures of experienced duo Arjen Robben and Franck Ribery.
Bayern president Uli Hoeness said it would require an "insane" sum to buy Sane, though, while chairman Karl-Heinz Rummenigge indicated the 23-year-old needs to decide for himself whether he wants a move.
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Sane, who joined City from Schalke for a reported initial fee of £37 million ($47m) in 2016, scored 16 goals in all competitions for the Premier League champions last term but only started 21 top-flight matches - six fewer than in the 2017-18 campaign, as he seemingly lost Pep Guardiola's trust.