The Dutch boss said: “I wanted to get him last year already. With Erwin [Koeman] we tried that, he's with the same management as Memphis, but the boy wanted to stay another year at PSV.
“Now we knew that we did not have to call. When Manchester United come, we have no chance.”
Depay agreed a switch to United earlier this month, passing his medical this week, and will link up with Louis van Gaal’s men ahead of next season.
Despite being just 21, Depay is seen as one of the best talents in European football, and his 28 goals in 40 games this season have been vital in PSV securing the Eredivisie title.
He is expected to immediately find a place in United’s first-team upon his arrival at Old Trafford, and Depay’s arrival shows that van Gaal is going all out to win the title with the Red Devils.
He is to be just one of many big name signings this summer, and securing his signature this early - the season has still yet to end - has given United an advantage over all their transfer rivals.
They may be the beneficiaries of Depay’s talents now, but if he had agreed a switch to St Mary’s last summer, the young attacker may have been firing Southampton to the Champions League this term.