The pair are in the hunt to become the first sailor in history to pull off the triple crown by becoming and Olympic, America's Cup and Volvo Ocean Race champion, but unlike their previous successes, they cannot pull it off together.
"It's going to be awesome racing against Tukey!" said Burling.
"We have huge respect for each others skill and talent and we are each other's biggest supporters. We are both in a position to gain amazing experience to bring to our future sailing goals. I look forward to sharing a few stories and beers with him in port."
Like Mapfre, Team Brunel, skippered by ocean racing veteran Bouwe Bekking, is a well-established team and considered one of the frontrunners for the 2017-18 edition. After the first two stages of "leg zero" Mapfre lead the rankings on 15 points, while Brunel are tied for second with Chinese entry Dongfeng Race Team.
Burling may have a compatriot on board Team Brunel, with fellow double Olympic medallist Jo Aleh in trials with the Dutch team. Aleh was on board for the first two stages of leg zero, and is expected to find out over the next week if she has been selected.
If Aleh signs up, she will be the first New Zealand woman to do the round the world race in 15 years.