Christian Horner says it is not in Red Bull Racing's plans to make a swoop for James Key from Scuderia Toro Rosso following the sister team's upturn in performance this year.

Toro Rosso has enjoyed a competitive first-half to the 2015 season relative to the bigger budget Red Bull team, with Key's contribution on the design being singled out for particular praise.

However, Horner insists Red Bull has no designs on poaching former Force India and Sauber man Key, saying the current team set-up is accomplished enough.

Related Articles

"[There is ] No interest at all," he told the official F1 website. "We have a strong technical team. Adrian (Newey) is still involved in all the things that are going on and with Rob Marshal, Pierre Wache and Dan Fallows we have a strong technical group - so no desire to change anything."

Though Horner has been a staunch critic of engine partner Renault for its failure to develop a competitive and reliable power unit, he nonetheless says Red Bull must improve all round.

"We are never satisfied. Here you always try to get better. The regulation changes over the winter did hurt us - probably more than we anticipated - but we now have a pretty good understanding of the areas where we need to improve - and how to improve."