Grimes has penned a new two-year extension that will keep him at the Tigers until the end of the 2023 season, adding to his 171 games in the yellow and black.
Prestia has signed a three-year extension onto his tenure with Richmond, securing his services to the club until the end of the 2024 season.
The two triple-premiership players will be looking to add a third-straight flag in 2021, with Tigers’ general manager of football talent Blair Hartley stating the signing news is a great boost to the club’s season preparations.
“Both Dylan and Dion have been a massive part of our recent success and are driven and hungry to help us strive for more over the coming years,” he said, per the club website.
“Dylan has been a fantastic servant of the Club’s for a long period of time and continues to set high standards for all of our players on and off the field.
“He is an excellent mentor for our young defenders and one of the best performing players in the competition.
“Likewise, Dion has been a consistently high performer for us across several years.
“It has been pleasing to see Dion rewarded for his hard work in recent years, but it has not changed his desire to keep pushing himself and the group forward.”
Grimes is now secured to play a 13th and 14th season with the Tigers, while Prestia will now have three more seasons to add to his 164-game career.