I mean I'm 99% sure that Dortmund is basically done with any considerable investment for the season and by the club's standards going ~€50m into the red between Bellingham and Can's buy option would already be unusual spending, even without the Rona.
But if we're leaving behind financial caution and venture into the more extreme realm of prossibility the muppets could speculate that the club could generate some sales income, say the reported €10m for Wolf, another €20m from Dembele if perhaps some English club decides to sign him, maybe another €10m for Dahoud or a bit more than that for Schulz.
The club should save around €20m in wages between Toprak, Götze and Schürrle, as well as reportedly netting another extra €20m on their main sponsorship from the 1&1 deal.
On the other hand Depay's contract is running out, Lyon supposedly have to offload players, after Ligue 1 got cancelled early, leaving them outside top 6. Reus has been injured for half a year again without a clear end in sight, Götze's position hasn't been filled yet. Moukoko is still 15, Reyna is 17, they aren't starters. If the club could finance it (and personally I don't believe they can right now) they could be tempted to sign Sancho's replacement a year early and bring in Depay, especially if Favre wants to go back to 4231, leaving space for one more attacker in the lineup - now that Hakimi is gone.