Iceland host Italy in Reykjavik on Tuesday, while Switzerland play England in a friendly in Leicester
Liverpool winger Xherdan Shaqiri was among the scorers as Switzerland routed Iceland 6-0 in their opening game of the Uefa Nations League in St Gallen on Saturday.
Steven Zuber and Denis Zakaria gave Switzerland a two-goal lead before Shaqiri fired in a free-kick from a tight angle out on the right on 53 minutes.
Goals from Haris Seferovic, Albian Ajeti and Admir Mehmedi completed the resounding win as Switzerland made a dream start to a group that also includes World Cup semi-finalists Belgium.
Iceland host Italy in Reykjavik on Tuesday, while Switzerland play England in a friendly in Leicester.