Newcastle United defender Kieran Trippier fractured a foot in Sunday's Premier League win over Aston Villa.
The England international, a £12m January signing, scored a free-kick in the 1-0 victory at St James' Park before being replaced in the 48th minute.
After the game manager Eddie Howe said Trippier "got stamped on".
A Newcastle statement on Monday said scans showed a fracture to the fifth metatarsal in his left foot.
They said Trippier is "set to be sidelined for the club's upcoming fixtures".
Trippier, 31, has made a significant impression since joining from Atletico Madrid, scoring free-kicks in successive wins over Everton and Villa.