Vitek, 16, is expected to join United as a scholarship in July.
The Red Devils, who followed Vitek throughout 2019, reached an agreement to sign the young cap in January.
However, they had to wait to formally sign an agreement.
Now Vitek, who is 6 feet 5 inches tall, admits that putting paper on a United deal is a dream come true.
“It’s a surreal feeling, a move to Manchester United is the dream of many guys who start playing football,” he said on the Czech club’s official website.
” I am really impatient. I admit that I did not even believe it when I discovered the interest of the club, but now it is definitely a reality. “
Czech club sports director Ladislav Minar said: “I am happy to say that Sigma is capable of sending another of his players to a leading European club.
“The departure of such a young player is above all a great prestige, which is a reward not only for the club, but also for the player himself for his hard work.
“Second, it’s also a financial aspect. If Radek were to play for the Manchester team in the future or move to another club, financial satisfaction would interest Sigma. “
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Vitek’s move to United as a researcher further expands the club’s already stacked goalkeeper ranks.
Beneath the club’s three seniors, David de Gea, Sergio Romero and Lee Grant, is a swollen collection of young corks.
This collection is headed by English under-21 goalkeeper Dean Henderson – who has impressed at Sheffield United in the past two seasons.
There is also Kieran O’Hara, the 23-year-old loaner to Burton Albion this quarter and another Czech, Matej Kovar, the under 23 goalkeeper.
Below, there are also Nathan Bishop, Paul Woolston, Ondrej Mastny, Jacob Carney, Alex Fojticek, Dermot Mee and Johan Guadagno in the club books at U23 and U18 levels.