McCaffrey will play Gordon Specter - father of Harvey Specter (Gabriel Macht) - in a third season episode, TVLine reports.
The character will feature in a flashback episode, to hit US screens on August 20.
Gabriel Macht previously told Digital Spy that the flashback scenes will take place "ten years" prior to present-day Suits.
"You're going to see what it was like for Harvey to be at the DA's office and working with Cameron Dennis (Gary Cole) and what went down and how he got out of there," explained the actor.
"You're actually going to see a scene with Harvey's dad - it's a great episode. It's great fun for the fans [to see flashbacks] and it's great fun for us too."
Guest star McCaffrey's past TV credits include roles on Revenge, Rescue Me and Blue Bloods. He is also known for voicing the title character in the popular Max Payne video game series.
Suits returns to USA on Tuesday, July 16 at 10/9c and airs on Dave in the UK.
> Game of Thrones star Michelle Fairley to appear on Suits
Watch a promo for the third season of Suits below:
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