The 26-year old USA international is currently a free agent after his MLS contract expired at the end of last season and he know just needs to pass a medical to join Frankfurt according to reports.
Clark is expected to sign a deal that will see him become an Eagles player for the remainder of the German season with the option for a further one to two years.
Eintracht Frankfurt media officer Carsten Knoop confirmed to Soccer365 that Clark will undergo a medical before putting pen to a deal with the club.
"Tomorrow, he will go to have the medical," Knoop said. "After that, if all everything is okay, I think the contract will be signed."