According to the local press, Barcelona are working hard to cover Neymar's loss with the club close to sealing a deal to buy Real Sociedad defender Inigo Martinez for around 32 million euros.
PSG and Barcelona, like Arsenal, are reported to have had a bid rejected for the player, but it is not known how much either side offered.
But Bosz refused to get drawn into entertaining the notion of Dembele leaving this summer, remaining unperturbed by talk of the Catalan giants coming to prise away the 20-year-old prospect.
"We know we're not in the best physical condition", said Ancelotti, who expects a "difficult, intense game" in Dortmund.
Teenager Jan-Niklas Beste, 18, could make his home debut after the Germany Under-17 international left-back impressed Bosz in training.
But potential doesn't come cheap these days.
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The same report indicates that the Spanish club are unlikely to be put off by the price tag, although they do add that Dortmund may still be reluctant to sell.
As for the Neymar loss, there's no way they can directly replace a player of such talent.
Wenger has confirmed he's in the market for further reinforcements after only signing two new players this summer and a new attacker appears to be on the bosses agenda amid on-going doubts over the long-term future of Alexis Sanchez and Alex Oxlade-Chamberlain.
Barcelona are desperate to sign a replacement ahead of the new season and are trying to land Philippe Coutinho from Liverpool.