Fox is impressing for Saints this season.
He told the Scottish Sun: â€œLeaving Everton was hard. It was the team I grew up supporting and I felt Iâ€™d let my family down.
â€œBut I vowed to work hard and try to get back to as high a level as possible.
â€œI remember meeting Davie Moyes just after I signed for Celtic and he was really happy for me."