Toro Rosso chief Franz Tost is expecting a fruitful partnership between Max Verstappen and Pierre Gasly at Red Bull over the coming seasons, but reckons there will be "problems" sooner or later between the duo such as their individual desire to win.
Red Bull were forced into action to find a new driver for 2019 when Daniel Ricciardo announced he would be leaving the team in favour of Renault, and Gasly was the man they identified as his replacement, with his promotion from Toro Rosso quickly confirmed.
Verstappen, in particular, is known for his aggressive style on the track and recently got into a physical confrontation with Esteban Ocon after a race, while Gasly has been known to be extremely competitive also.
Tost thinks the pair will get along eventually, but there could be issues in co-existing.
"I expect it will be a good partnership," the Toro Rosso boss said in Abu Dhabi.
"Both drivers want to be successful and there will also be earlier or later problems over there [at Red Bull] during a race.
"But that is normal in Formula One. Drivers are fighting for positions and both driver want to have success. But I expect, as both drivers are professional, they will sort it out in the best possible way."
Gasly has impressed in his rookie season in F1, gaining 29 points, and Tost thinks the Frenchman has did a good enough job to warrant the promotion.
"Pierre is really doing a good job," he said.
"He improved a lot as the season went on and I am really happy with him."