In an interview with German television channel Sport1, Marko took a little bit of the pressure off the Mexican, reiterating he still has a contract until the end of 2024.
"I repeat myself, Pérez has a contract and we want to respect it," said Marko to Sport1.
"We are doing everything possible to get him back to normal.
"We simply have no alternatives. Otherwise, we could have a problem."
Alonso reinvigorated in 2023
Having previously 'retired' back in 2018, Alonso's surprise return to the sport in 2021 didn't quite go as planned, as he suffered two years of midfield running in an underperforming Alpine car.
The Spaniard's decision to move to Aston Martin for 2023, replacing the retiring Sebastian Vettel, looks like a solid career move now, with the 42-year-old back up at the sharp end of the drivers' championship and scoring regular podiums.
Verstappen, Lewis Hamilton and Alonso are the only world champions left on the grid, and Marko believes Alonso would be more likely to match the Dutchman than Hamilton.
"At the moment, I only see one person who could get close to Max and that is Fernando Alonso," Marko stated.
Alonso will be looking to build on his sixth-place finish at the Qatar Grand Prix as F1 heads to Austin, Texas for the United States Grand Prix.
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.