"He must realise he can be the leader of the younger players and when Alan goes he can be captain." Sir Bobby told The Journal.
"It's up to him.
"When Gary and Alan were out in the past, we've made Kieron captain and he has responded to that responsibility.
"He's in his mid-20s now and he should be focused on what he is doing both on and off the pitch.
"He needs to know what his ambition is and I feel this will be his best season for Newcastle."
Fellow midfielder James Milner has pledged his left midfield credentials for England.
"People have talked about England, and being able to play on the left could help me. But, to be honest, I'm not thinking too much about that at the moment because I'm trying to get into my club side first.
"I think being able to play in a variety of positions is a help rather than a hindrance. Some people think you're better to have a specialist position, but I think being versatile will help me get more first-team experience.
"I'm happy playing anywhere attacking. At Leeds I started on the right, but I went over to the left and played more than 30 games. When you look at the players at Newcastle I don't want to be just going up against one of them for one position.
"But, yes, I'm fine playing on the left, and if that's where the manager wants me to play then I will do so happily."
Meanwhile another left winger and toon target Marc Overmars has decided to call it a day.
Good move Sir Bobby. Dyer can produce the goods when he has to and this newfound responsibility might help. As for Milner, I really hope he progresses on the left - so we can have a Newcastle player in the England first-team again! Voice your opinions on the messageboard.