The former Marseille winger became the Magpies' fifth summer signing earlier this week.
The pacey winger arrived on Wednesday on a five-year deal, and the Magpies manager feels it was the club's ambition that tempted him to do so.
He said: “He’s been able to look at the signings we’ve been making and say, ‘Woah, they’re ambitious’. I think six or seven weeks ago, everybody was maybe doubting that, would the words at the end of the season come to fruition?
“He’s seen the quality and knows the players, and he knows it’s a big club.
“I had a good conversation with him and he’s a very intelligent player…He’s seen the potential of Newcastle and he wants to be a part of it.”
McClaren’s words will be music to the ears of the Toon Army and they will hope the Frenchman's performances on the pitch reflect his enthusiasm for the move.
Thauvin arrives as Newcastle’s fourth marquee signing of the summer, following the high-profile captures of Georginio Wijnaldum, Aleksandar Mitrovic and Chancel Mbemba.
Mike Ashley’s promise - to Sky Sports at the end of last season - to invest in the squad has been kept, and the calibre of players brought in so far suggests that exciting times lie ahead, if McClaren can get them gelling.
It’s been a mixed start to the season for the Magpies but signs of something positive being built have been evident, and Florian Thauvin could prove to be the spark that ignites Newcastle’s attacking potential.