Sebastian Vettel leads the delegation of Formula 1 drivers who have decided to join a meeting with Pirelli in Milan on Tuesday to discuss 2017 rules.
Following a suggestion last year for greater dialogue between the drivers, teams and F1's tyre supplier, the meeting was originally set up to allow some open dialogue about the direction F1's tyre regulations should head in the future.
But, as Motorsport.com reported earlier this week, in the wake of a deadlock over 2017's aero rules the meeting had now taken on wider significance.
Sources have suggested that the meeting will be used as a forum to try to get 2017's rule changes back on track with time running out to get them agreed.
F1 supreme Bernie Ecclestone and FIA president Jean Todt are both present, while team figures may also include Ferrari president Sergio Marchionne.
Vettel is also there and has been joined by Felipe Massa and Valtteri Bottas, while Nico Rosberg may also attend.
Under F1 rules, changes to the 2017 regulations can be agreed by majority support up until the end of this month, but after that modifications will need unanimous approval.
Teams cannot agree on the degree of aero changes that should come for 2017, which is why tech chiefs have asked for guidance from the Strategy Group.