QPR winger Townsend happy seeing Clyne impressing at Southampton
The pair came through the ranks together at Tottenham before Clyne switched to Crystal Palace, where they came up against each other many times.
They have also been team-mates for the England Under-19s and Under-21s.
And Townsend told The Sun: "We've known each other since we were 3ft tall! Every time I've played against him, he's performed well.
"We both know each other's games inside out so it's going to be a tough battle. Hopefully, I can chuck in a few surprises for him."