The following season 2016-17 he remained a Stage 2 player but moved to the Glasgow regional academy.[6]
On 25 July 2017 it was announced that Henderson would be loaned out to Stade Niçois, a Federale 2 club in France, outwith the French professional leagues.[2]
Professional career
Henderson was playing for Glasgow Warriors under 16 side while still at Strathallan School.[7]
He managed to score a try on his debut, with The Glasgow Herald noting that Henderson seemed hungry for success.[9]
At Glasgow Warriors he is mentored by Finn Russell. Henderson said: "The main thing I took from my most recent chat with him is not just playing what is in front of me, but thinking a couple of phases ahead to give myself time on the ball and that has helped me a lot."[10]
Henderson graduated to be a Stage 3 academy player for the 2017-18 season.[11] Stage 3 players are assigned to a professional club and Henderson is assigned to Glasgow Warriors.[12]