Krystian Bielik: Derby County midfielder has season ended by knee injury
Derby midfielder Krystian Bielik will miss the rest of the season after suffering a "significant" knee injury playing for the club's under-23 side.
The 22-year-old featured for the Rams youngsters against Tottenham on Monday ahead of his planned return from a three-game suspension.
His ban followed a red card in the win over Charlton on 30 December.
Rams boss Phillip Cocu said the full extent of the injury is not known because the knee remains inflamed.
Poland international Bielik has made 21 appearances for Derby since arriving from Arsenal on a five-year deal in the summer.
Cocu told the club website that the injury was "hard" on Bielik as it will also rule him out of the European Championship with Poland in the summer.
"For him personally it is a huge setback and mentally it is hard on him, but it's also not good news for the team," he added.
"But he is mentally strong and we will support him as much as we can."