Brit Ticktum has been highly-regarded by Red Bull and there have even been rumours that he was an option to either join or replace New Zealander Brendon Hartley at the Toro Rosso Formula 1 team next season.
Schumacher naturally attracts a lot of attention given his racing pedigree and he must now be in the frame for an opportunity in Formula 1 in the near future.
"He has a lot of pressure on him," Armstrong explained. "He was never that quick previously but he has managed to put it all together quite well this season."
Armstrong is yet to confirm his plans for 2019 but he might also start to appear on the radar of Formula 1 teams. He is contracted to Ferrari but isn't sure what they have planned for him.
"I wish I knew to be honest but I just need to finish this season. I am lucky that I have the [Ferrari Driver Academy], which is very much behind me. I haven't been told anything but I know the wheels are in motion for what comes next.
"It is almost certain that I will continue with Ferrari next year.
"I feel very privileged to have this backing."