The forward spent around two years with Newcastle before leaving in 2012.
Ipswich Town won against Leeds United in the Championship on Saturday.
West Bromwich Albion will reportedly not sign Leon Best in the summer transfer window.
HITC Sport understands Huddersfield Town have offered trialist Leon Best a short-term deal at the club.
Nottingham Forest are currently favourites with Bet Victor to sign Derby County loan flop Leon Best
On loan Derby County striker Leon Best posted an image of himself with former Newcastle United teammate Peter Lovenkrands on Instagram, following the Danish attacker's announcement to retire from professional football:
Nottingham Forest were held by 10-man Derby County this afternoon as the East Midlands rivals played out a 1-1 draw at The City Ground.
Will Leeds United land Zan Benedicic? Is Leon Best destined for Derby County? And have Middlesbrough won the race for Patrick Bamford in time for opening day?