(AP Photo/Peter Dejong)MADRID – American right back Sergiño Dest is set to join Barcelona, coach Ronald Koeman said on Wednesday. The Ajax player underwent a medical in Barcelona and the clubs were finalizing the details to make the transfer official, the Barcelona coach said. “I think that kind of experience will help the player but also will help the American national team,” Koeman said. The 19-year-old speedy defender has a Surinamese-American father and Dutch mother, but chose to play for the U.S. national team instead of the Netherlands. Dest committed to the U.S. national team last October, a month after making his senior debut for the Americans.