World No. 4 Alexander Zverev has confirmed that Ivan Lendl is joining his team, the German said on Instagram on Tuesday.

Eight-time Grand Slam champion Lendl, who coached Andy Murray to three major titles, was spotted on court during a practice session Zverev had with Evgeny Donskoy at the US Open on Tuesday.

Zverev was asked about a possible collaboration with Lendl last week in Cincinnati and was full of praise of the ex-world No. 1.

“He knows what it takes, he knows what it takes to win at every single level of our sport so he’s definitely someone that can help a lot,” Zverev told reporters in Cincinnati.

“I don’t have any coaching changes right now, that’s not what I mean, but in the future, yes for sure I think he’s somebody that can help. If that happens I promise I’ll let you know and you guys and write a big or small story about it, whatever you choose. ”

Zverev, who is coached by his father Alexander Sr., had previously worked with Spanish former world No. 1 Juan Carlos Ferrero from mid-last year until January at the Australian Open. After their split, Ferrero implied that a lack of discipline and respect led to them parting ways.

Lendl is not the only former member of Murray’s team to be part of the Zverev camp. The young German also partnered with Murray’s ex-fitness trainer Jez Green, as he continues his bid for a maiden Grand Slam title.