United Kingdom, Nov. 28 -- Dolph Lundgren felt "a little guilty" when he broke Sylvester Stallone's ribs.

The 68-year-old actor portrayed villain Ivan Drago in Rocky IV and he left his co-star, who played the titular character, seriously injured following a fight scene, but had no idea until some time afterwards.

Speaking to Fox News, Dolph said: "I didn't know it happened, we were both getting hit in that fight.

"We shot for two weeks in Vancouver, and I got back to L.A.The producer called and said, 'Hey, Dolph, you got two weeks off.' I said, 'That's great, what's going on?' 'Sly's in the hospital.' I found out that way.

"I did feel a little guilty. You know, he hit me too. He was the boss, I did what he told me, which was good. Go ...