Martinez is breathing a sigh of relief after discovering Diame only suffered minor ankle ligament damage at the DW Stadium.
"We have been very lucky," the Latics chief said.
"It was a horrific challenge. We have seen it a few times. At the moment of contact his leg is off the ground.
"If it had been on the ground, it would have been a break. Thankfully, he has only damaged his ligaments."