McLaren have refused to back one driver throughout the season, with chief executive Zak Brown
saying last month he would rather lose the championship to Verstappen than favour one of his drivers.
Stella confirmed this will remain the case for Abu Dhabi until there is a situation where a driver needs to help his team-mate, so the team can win the Drivers' Championship.
"There will be no call which excludes the other driver when the other driver is in condition to win," he said.
"So, we will see what scenario will unfold, but definitely what I can say is that there will be conversations, and there will be a way of going racing which is united between the team and the drivers, like we have always done."