"It's unfortunate that we have to play without our captain, as he is very important to us. However, we've found solutions in the past when he couldn't be with us," said Brian Riemer after the game against Belarus.
"We have a large squad and must find solutions. Today, we had players from Marseille and Arsenal on the bench. They can both play in the defensive midfielder role, just like Victor Froholdt," Brian Riemer explained.
Morten Frendrup last played for the national team in March, when he was substituted in the Nations League quarter-final against Portugal.
Since January 2022, Morten Frendrup has played for Italian Serie A team Genoa, where he has been a regular in the midfield almost continuously.
He performed consistently last season, earning him the captain's armband for the Italian club on several occasions.
This season, he has not yet captained Genoa, but he has played every Serie A match from the start.
Morten Frendrup received his football upbringing in Brondby.
Denmark will face Greece in the Parken Stadium on Sunday at 20:45 CET.