The BBL website states: "There's no doubt the Great Britain forward is warming up in a big way for Riders now and driving them towards more silverware.
"His all-round skill-set, in addition to the intangibles he also offers are of absolute importance to Riders as they continue to lead the title race at the top of the table."
Sullivan put up a huge 25 points, 6 assists and 5 rebounds in the 84-59 win over Manchester at the weekend, which took the Riders into the top position in the BBL Championship. The victory against Manchester Giants sealed an incredible calendar year unbeaten on the home floor for the Riders.
The full BBL Team of the Week for Week 22 is here.
The Riders play again this Sunday when they take on the Glasgow Rocks away from home in the BBL Championship.