#3 Ryan Giggs
After a horror season under David Moyes, when Manchester United did away with the Scotsman, Giggs was kept as an interim player-manager and he did well for the four games he had at his disposal.
Working as an assistant under Louis Van Gaal, the Welshman got a good chunk of experience and he left after Van Gaal parted ways with the club.
In wide reports that flourished last year stemming out of Wales, Ryan was closely linked with the managerial job of Swansea City but ultimately it turned out to be unsuccessful. However, after Chris Coleman left for Sunderland, Wales took a chance and appointed him as the manager of the national team, which was a huge step up in itself.
He is still experimenting with his formations as he's played 4-3-2-1, 4-4-1-1 in different games but there is a lot yet to see. Giggs with decades of experience will be one to watch out for.