Newcastle United defender Fabian Schar will be "out for a few months" after suffering a knee injury in the 3-2 win over Southampton on Saturday.
Switzerland centre-back Schar, 29, posted on social media to say the injury was "difficult to accept".
He added his aim was "to be ready for the Euros", which take place this summer.
Newcastle said: "He will undergo further assessment with a specialist consultant in the coming days before beginning his rehabilitation with the club's medical team."
Schar going off at St James' Park meant the Tyneside club, who had already made three substitutions and had Jeff Hendrick sent off, played the last 18 minutes with nine men.