The American striker scored three goals — two in extra time — as AZ advanced with a 4-1 triumph over Sparta Rotterdam.
The 22-year-old striker notched a hat trick, including two goals in extra time, as AZ advanced Wednesday to the third round of the Dutch Cup with a 4-1 win over Sparta Rotterdam.
Johannsson, who has four goals in seven league games for AZ this season, open the scoring five minutes in, then broke the deadlock in the 91st minute before adding an insurance goal in the 105th minute.
The Icelandic-raised Alabama native committed to the USA last month, filing a one-time switch with FIFA before appearing off the bench in a friendly win over Bosnia-Herzegovina and a World Cup qualifying loss to Costa Rica.
AZ returns to the field Saturday with an Eredivisie match at home against PSV.