Norwich City assistant coach Christoph Bühler confirmed that Dimitris Giannoulis will be out until the end of April.
Bühler stood in for David Wagner at the press conference ahead of Stoke City, with the head coach away due to a personal family issue.
“David is doing okay," Bühler confirmed. "We've followed our routines in the week, and our preparations have been the same. He will be back with us tomorrow for the game.
“Dimi will take longer than we hope. He will be out until the end of April, and miss the next few weeks. Possibly back for the start of May.
"Shane Duffy will hopefully be back after the international break. Everyone else will be okay for the weekend. Jonny Rowe is on track."
The German also spoke about last weekend's win against Rotherham United, as well as a look ahead to Stoke.
“We put a good performance out, and totally controlled the game. We will take it into this week, and take into Stoke.
“Stoke will be a lot tighter. They've found a way to be hard to break down. They're energetic and have quick runners, we will face a team who have to collect points because of their situation. I think it will be tight.
“It's the crucial part of the season. In the Championship, so many teams play for something. There will be so many twists and turns, you must approach it game by game.
“We have to take it game by game and not look too far ahead. We look at us, look at Stoke, and what we can get out of it."