Brighton and Hove Albion defender Shane Duffy believes Roberto Martinez's arrival at Everton was crucial for John Stones' development.
David Moyes' Everton exit was the best thing to happen to John Stones' career, according to his former team-mate Shane Duffy.
The two were at Goodison Park together, with Republic of Ireland international Duffy initially ahead of the now Manchester City man in the pecking order.
However, former Barnsley defender Stones soon won a place in Roberto Martinez's team after Moyes left for Manchester United and he has gone on to become an England regular.
"I got on well with him [Stones]," Brighton and Hove Albion's Duffy told the Argus.