Newcastle are unsure whether defender Kieran Trippier will return before the end of the season following foot surgery, says boss Eddie Howe.
Trippier, who joined from Atletico Madrid for £12m in the January transfer window, also scored a free-kick in the victory over Everton on 8 February.
Howe said Trippier's operation on Thursday "went well".
"That was good news, but I don't know how long he's going to be out," he added.
"We hope to have him back before the end of the season, but it's obviously a significant injury, which is a big blow to us because he was performing so well.