Grayson is 50 not that, as much as I enjoyed most of his reign, near the end with that shadow over him and results going south, he looked a man under pressure, thankfully back with his wife but Leeds again maybe a bridge to far.

MB has his own close team around him Carlos was not a Bielsa signing. I would think Poyet would be a closer fit but again he's 52 has managed and played in PL, cannot see such an experienced guys wanting to be U23 manager..apart from Redders where he was great in that role..
Another experienced guy Paul Cook who has just left Wigan. When you look at his record, the clubs he has managed and what he achieved on a shoe string mostly, why he is not linked with more clubs am not sure.

I expect they be scouting for an upcoming U23/Youth coach.