Argentina’s opening match at Russia 2018 ended in a 1-1 draw in Moscow after Alfred Finnbogason’s historic goal cancelled out Sergio Aguero’s opener in Saturday’s Group D meeting.
Messi was denied by Hannes Thor Halldorsson when he took a second-half spot-kick – and he recorded 11 shots in the game without beating Iceland’s goalkeeper.
Argentina’s captain, a three-time beaten finalist at major tournaments with his country since 2014, does not want to panic after Iceland claimed a major scalp on their World Cup bow.
“It was hard for us to break, it’s not easy when a rival plays so far back,” Messi told reporters.
“The penalty was painful, I feel responsible.
“We do not have to go crazy, we deserved to win, but we have to improve a lot, now we have to be calm.”