Jordan Pickford, Sandro Ramirez and Cuco Martina are among the 25-man Everton squad which left for Holland on Monday afternoon.
Goalkeeper Pickford and forward Sandro had been given extra time off following their participation for England and Spain respectively in the European Under-21 Championship in Poland. Dutch defender Martina also makes the trip to his homeland after his signing was confirmed on Monday.
Ross Barkley has not travelled owing to the groin injury which prevented his travelling to Tanzania, neither has Ramiro Funes Mori, who is recovering from a knee injury sustained last season.
The squad departed Liverpool Airport on Monday afternoon for Enschede in east Holland ahead of a pre-season friendly against FC Twente on Wednesday (6pm kick-off UK time, 7pm local time), before travelling to Belgium to take on KRC Genk on Saturday 22 July (3pm UK time, 4pm local time).
Everton Squad: Maarten Stekelenburg, Joel Robles, Jordan Pickford, Leighton Baines, Ashley Williams, Phil Jagielka, Callum Connolly, Mason Holgate, Jonjoe Kenny, Cuco Martina, Michael Keane, Morgan Schneiderlin, Davy Klaassen, James McCarthy, Idrissa Gana Gueye, Gareth Barry, Mo Besic, Tom Davies, Kieran Dowell, Kevin Mirallas, Aaron Lennon, Dominic Calvert-Lewin, Ademola Lookman, Wayne Rooney, Sandro Ramirez.