Wingerli was selected to his first senior team, when he was among the Swedish team announced to compete at the 2021 IIHF World Championship in Riga, Latvia. He made his full international debut for Sweden in the Tournament opening game against Denmark in a 4–3 defeat on 22 May 2021. He scored his first international goal, marking the opening goal in a 4–2 defeat to the Czech Republic on 27 May 2021. He finished the tournament with 3 points through 7 round-robin games, as Sweden failed to progress past the group stage with a 9th place finish.