Retiring? Look at all the great managers at club level who couldn't hack it with international teams.
It takes a very good manager and coach to hold together (and make better as a team) a clutch of gifted individuals. Roberto has that. FFS he even made Moyes' yard dogs the best football side in the PL before the Everton Anarcho-Syndicalist tendency revolted against having to pass the ball accurately.
The best side?
Could have sworn we came fifth that year