Benfica are seeking a buyer for Julian Weigl.
And the Portuguese giants have set a price of €30m to do business for the midfielder.
Only 25, the Germany international is fielding lucrative offers from the Middle East.
Weigl came through the academy at 1860 Munich before moving to Dortmund in 2015 - the same summer Tuchel became the Bundesliga club's manager.
He was a regular presence under Tuchel, making 94 appearances in two seasons before the German was sacked in 2017.