Matt Damon can't work with Ben Affleck again until his friend stops keeping the "best roles" for himself.

And with Ben now working more as a director, Matt would also happily star in one of his films - but only if his pal stayed behind the camera.

He said: "I would love to write another script with Ben; I love Ben, I love his work, he's been my buddy for 35 years. The big issue is time for us. We have a company together so we work on a lot of projects together, but to try to carve out the time is really tough.

"I mean we both have a whole mess of kids now, and these other days jobs.

"He's directing all the time and I'm off working with these other directors. "The thing about 'Good Will Hunting' is that we were unemployed and we weren't writing the script on a deadline either. Nobody was expecting it, so we were just these two idiots in our basement writing this thing, and now we have all of these pressures of the lives grown-ups have.

"So I would never say never because I would absolutely love to write with Ben again, and I'd love to collaborate with him on anything, he's brilliant. I'd love to be in one of his movies that he directs.

"The problem there is that he just keeps giving himself the best roles, so until he stops doing that and maybe just directs, none of us can really work with him."

Matt - who raises Alexia, 17, Isabella, 10, Gia, seven, and Stella, five, with wife Luciana - will always treasure working with the late Robin Williams on 'Good Will Hunting' and is "deeply grateful" to the actor for helping change his life.

In a Reddit AMA, he said: "Working with Robin almost defies description. He was one of the most generous, loving, wonderful people I've ever met. He had this capacity that I've never seen on a movie set.

" When everyone started to get tired and started to flag a little bit, he would launch into stand-up. We knew it was original because he was making fun of crew members and pulling them into these bits. It was like 15 minutes of the best stand-up ever that was just privately for us.

"Everyone would laugh and laugh and laugh and then everybody would get this boost of energy and go back to work.

"I'll never be able to thank him enough for what he gave us. In my heart, that's where he is, as this person that I'm deeply deeply grateful came into my life and changed it for the better."