Rooney was a spectator for England's opening two matches due to suspension but has seen how quickly Welbeck has adapted to tournament football and inadvertently played a small part in his winning strike against Sweden.
"It was funny actually, I spoke to him at half-time and he was anxious because he wasn't getting chances," said Rooney. "(I said) it's important that he bides his time, doesn't get annoyed, gets in the box and his chances will come. He got his chance and he took it well. Obviously he was delighted and we were all delighted for him.
"We all speak to each other and it's easier if you are sat in the stand because you can see how the game is developing. If I can help him or any other players or if the coaches can help him then there is no hesitation in doing that.
"We obviously know each other -we've trained together all season and played a lot of games together. I feel we have got a good understanding so I think it is an option for the manager."