The #6 Arrow McLaren Racing SP car will remain available for Robert Wickens to join should he return to full fitness according to co-team owner Sam Schmidt.
After a horrific crash during the opening laps of the 2018 ABC Supply 500 at Pocono Raceway, Wickens was left with a long list of injuries, the most severe of which left him partially paralysed.
Despite not being able to currently drive an IndyCar, Wickens remains part of the team's driver line-up with the #6 being kept open for him.
When asked if the driver numbers had been decided between their drivers, Schmidt said: "We have obviously got our hand on 5 and 7 and holding 6 for Robert to come back.
"So, yeah, bottom line is 5 and 7 and it hasn't been allocated yet."
Since the crash, the Canadian driver has been attending rehab to help overcome the injuries he sustained in the accident.
It was also confirmed Wickens will remain with the team in his role as a driver coaching assistant, and will also attend many of the races to assist the team's new youthful driver line-up in Oliver Askew and Patricio O'Ward.
"Robert continues to inspire and motivate and just amaze everybody on a daily basis," added Schmidt.
"Because he's continuing the program, he's continuing to improve, he is a part of the team as a driver coaching consultant and will continue.
"And I think that's one of the major assets we have that Oliver was talking about in that he will be there at a majority of the races next year assisting these young guys to get acclimated as quick as they can.
"So he's part of the team, but also he's got a major focus on his rehabilitation and he's hell-bent on driving again and I wouldn't bet against him."
