West Ham have completed the signing of Ajax midfielder Edson Alvarez.
The Mexico international joins West Ham for 35m.
"It's a hugely sentimental moment for me in my career - it is a dream for me and my family," Alvarez said.
"The Premier League is a special league, the best league in the world and I think my style will suit it.
"I now have a responsibility to West Ham and the West Ham family and I will give absolutely everything for the shirt."
Manager David Moyes added: "We're really pleased to add Edson to our squad. The midfield area was one we were especially keen to strengthen this summer - and Edson will complement the other options we have in that department.
"He's an experienced international player, who has enjoyed great success for both club and country during his career to date."