The Bianconeri produced 3-0 victory on Monday night, as Di Maria scored on his debut, followed by a Dusan Vlahovic brace. However, the Argentine limped off in the second-half.
“I am not worried," Allegri told DAZN after the final whistle.
“We'll see what the tests say tomorrow. Unfortunately, these things happen in football. He had this adductor issue a week ago too, perhaps I should've taken him off when we were 3-0 up, but he was enjoying himself out there. Zakaria just had a cramp, nothing more.
“The important thing is that we won a game that we really wanted to win, which was by no means simple.
“We started strong, then lost the ball two or three times playing out from the back and you could see we were fragile at that moment," continued the coach.
“We couldn't get hold of the game. I put Di Maria wide and Juan Cuadrado on the other flank, that's all. After the break we threw the ball away too many times, we needed to finish the moves better.
“I am honestly amazed by how well Bremer has settled in. He is very calm, I only had to tell him off once in the second half when he tracked Domenico Berardi to midfield, in those situations, you need to let it go."
On Vlahovic, he added: “He is happy when he scores goals, but as always he needs to improve his choices. I am happy for him, he needed those goals."