Attorney Todd Hollis, who is representing Spriggs, issued the apology Friday on behalf of his client to Bryant Reed of KDKA-TV in Pittsburgh.
"I wanted to make this statement public. And to extend an apology to Aaron for what he's gone through, but I clearly know this was not him," Hollis said.
Donald's attorney, Casey White, told ESPN's Lindsey Thiry that Spriggs swung a bottle at his client and other people around Donald stepped in to intervene.
"At that point, that's when other people come to Aaron's aid and defend him by removing, so to speak, Mr. Spriggs from the area where he is punched and he is fighting; it's a mutual fight at this point between other individuals who Aaron does not really know," White said.
White also told Thiry his firm obtained eyewitness accounts from five people and that other individuals were willing to provide statements.
Earlier in the week, Hollis told TMZ Sports he was filing a criminal complaint on behalf of Spriggs. The Pittsburgh-based attorney said the altercation began inside a nightclub when Spriggs bumped into Donald. He said both men were asked to leave the club and alleged things got physical outside the building.
Hollis said Spriggs suffered a broken eye socket, broken nose and concussion and required 16 stitches.
Donald, who was born in Pittsburgh and played college football at the University of Pittsburgh, recently completed his seventh NFL season with the Rams.