Batshuayi was taken off on a stretcher late in the Ruhr derby, having appeared to roll his ankle, and the striker confirmed Dortmund's fears on Monday.
Batshuayi is expected to return to Chelsea for the remainder of the season in hope that the medical team at Stamford Bridge can get him back to fitness as soon as possible. However, he could still recover in time for the FIFA World Cup in Russian Federation.
The Chelsea loanee has been a revelation at Dortmund since his arrival in January, scoring seven goals in only 10 league games.
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He added that USA citizens need to "fight" for American values, and that "impeachment, in a way, would short-circuit that". But Trump later told NBC's Lester Holt that "this Russian Federation thing" had been a factor in his decision.
"Thank you all the awesome amount of love I received since yesterday".
But Belgium global Batshuayi faces a battle to recover from injury in time for the World Cup after suffering the injury in a heavy challenge from Benjamin Stambouli.
Batshuayi, 24, has scored six goals in 14 caps for Belgium, who are ranked third in the world going into this summer's World Cup in Russian Federation.
Batshuayi's injury is a blow to Dortmund's Champions League qualification hopes, with Peter Stoger's men fourth in the table, four points clear of RB Leipzig with six matches remaining.