The American-Icelandic forward scored for the third time in as many games, hitting for an equalizer from the spot to help AZ to a win over the Dutch power.
Playing in the departed Altidore's role as leading striker for AZ Alkmaar, Johannsson scored for the third time in as many games, tallying an equalizer from the penalty spot in AZ Alkmaar's 3-2 victory over Ajax on Sunday.
Johannsson, who also scored and had an assist in a loss to Ajax in the Dutch Super Cup a couple of weeks ago, scored in the 66th minute to pull AZ even at 2-2. Viktor Elm scored the winner eight minutes later, as AZ won its first match of the young Eredivisie campaign. Johannsson had scored in the regular season opener against Heerenveen, also from the penalty spot, while assisting in the club's other goal in a 4-2 loss.
Johannsson, who holds dual American-Icelandic citizenship and has filed his one-time switch to FIFA in order to be eligible for the U.S. men's national team, is set to be called into camp by U.S. manager Jurgen Klinsmann ahead of Wednesday's friendly against Bosnia-Herzegovina in Sarajevo.
If his switch is not approved by FIFA ahead of the match, he will be ineligible to play in the game, but he can train with the side while getting acclimated with his new international teammates. Johannsson was born in Alabama to Icelandic parents but has previously represented Iceland's U-21 side, which makes the FIFA switch process necessary.