Burnley and Wales defender Connor Roberts is in hospital with an infection.
Roberts, 26, made his Premier League debut for Burnley at Newcastle United on Saturday, 4 December.
He was not involved in Sunday's goalless draw with West Ham United.
"Unfortunately Connor has got a really bad bug that eventually turned into an infection, so he's had to go into hospital to make sure that's clear," said Burnley boss Sean Dyche.
"He's feeling a bit better now, but he's got to stay in over the weekend to make sure this bug clears."
Roberts joined Burnley from Swansea City in August 2021 having made 152 appearances for the Welsh club.