5. Adam Booth
Booth famously led Groves to British and Commonwealth glory and helped mold the Londoner into one of the most explosive punchers in his division. Of course, they parted ways a few years ago and it seems unlikely they would join forces again – however it’s not out of the question.
Booth is one of the most respected trainers in the world having also led David Haye to numerous world titles and currently trains a talented crop of fighters, including Andy Lee and Chris Eubank Jnr.
Booth and Groves seemed a great match when they were working together and a reunion could lead Groves to that world title which has so far eluded him.