Barca are into the final on aggregate 3-2, after winning the semifinal second-leg 3-0.
The one slight negative to Wednesday's win was a late injury to Pique.
"We have to wait on Pique," Koeman explained. "We will know more tomorrow. It's not the same (knee) injury. We will see tomorrow.
"He was great today and was one of the team's leaders. He defended really well. He got forward well and it was a great cross (from Griezmann). He scored at a vital moment. The team was phenomenal, though, it's not just one player. The whole team can be proud of themselves."