Mercedes supply Aston Martin with their power unit, gear box and a few other parts.
Stroll is hoping that could give his team the advantage over the rest of the field to close the gap on the Silver Arrows.
It could also give Vettel the tools to launch another challenge on Hamilton’s crown.
“Sebastian had a very challenging year last year,” Stroll said of Vettel, who was released by Ferrari.
“All of us would find it challenging that you lose your job before the season starts. That’s mentally very difficult, and you know how mental a game F1 is for drivers.