The foreign law side of the Czech Republic has signed a three-year contract with the two more seasons.
Coufal, 28, joins former Slavia and national teammate Tomas Soucek at the Hammers.
And he’s desperate to emulate midfield by making it take effect at London Stadium for a moment.
The new boy, who will wear the number 5 shirt, said: “I am very pleased to be part of the West Ham family.
“I will make West Ham successful.
“I know the interest the West Ham had in me for a long time, but now I’m still here and I’m very happy.
“Tomas told me that the most productive thing is that it is a smart stadium with intelligent enthusiasts and very productive teammates and staff.
“Tomas is my very intelligent friend and I hope you’ll join me here. “
West Ham chief David Moyes said: “We are very happy to welcome Vladimer and his family circle to West Ham United. “
“He’s a player we’ve been following for some time and all our reports are impressive.
“It has many attributes and qualities that we will allow you to temporarily adapt to the demands of the Premier League. “
He added: “Vladimer adapts to the profile of the type of player we are going to bring to the football club: hungry, ambitious and determined. “
“It’s a skill shown with delight in the Champions League and international, but we believe his years are still ahead of him here at West Ham.
“We want to give Vladimer some time to settle down and get used to his new environment, but having Tomas Soucek here will help him in that direction, and we’re sure it will have a positive effect and become a wonderful addition to the team. “
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