Stephen Macht will appear in an upcoming episode of the USA drama as uptight Harvard Law Professor Gerard, TVLine reports.
Gerard is said to have a tense relationship with Gabriel's character Harvey Specter.
The 71-year-old Stephen is a veteran film and television actor, having appeared on Knots Landing, Cagney & Lacey, Star Trek: Deep Space Nine and General Hospital.
Suits previously cast Revenge actor James McCaffrey as Gordon Specter, Harvey's on-screen father.
The series is currently on hiatus and will return to the USA network later this year. Suits airs on Dave in the UK.
> Gabriel Macht Suits Q&A: 'Season three is the British Invasion'
Watch a promo for the return of Suits below: