Red Bull would be "foolish" not to consider an approach for George Russell when his Mercedes contract expires next year, says team principal Christian Horner.

While three-time world champion Max Verstappen is under contract with Red Bull until 2028, the poor form of team-mate Sergio Perez has cast doubt on their lineup.

Perez started 2024 with four podium finishes in his first five races, but he has since endured a run of 13 outings without a top-three finish to slip to eighth in the drivers' championship.

Russell is set to become Mercedes' lead driver for 2025 when Lewis Hamilton joins Ferrari, but with the Silver Arrows' team principal Toto Wolff repeatedly talking up the possibility of moving for Verstappen, his long-term future is in doubt.

With Russell's contract expiring after next season, Horner says Red Bull could swoop for him to fill a "gap" between their current drivers and those coming through their academy.

"We've got a gap now but we just want to take time to consider what those options look like for the future," Horner told Sky Sports F1.

"And we're not afraid to go out of the pool. You know, George Russell is out of contract at the end of next year. It would be foolish not to take that into consideration.

"There are other talented drivers that could well be out of contract as well."

Russell claimed his second F1 race win in Austria earlier this year and currently sits seventh in the drivers' standings, 11 points ahead of Perez.

Horner's comments on Russell were put to Mercedes boss Wolff, who accused his counterpart of "stirring".

"He is always stirring s*** up on his part," Wolff said. "It's part of the game.

"George is a Mercedes driver, has been forever and hopefully will be forever. He has a long contract with the team."

The Silver Arrows endured a frustrating outing at last weekend's Singapore Grand Prix, Hamilton finishing fourth and Russell sixth after early difficulties with the team's split strategy.