Steve McClaren is sweating on the availability of Rob Elliot for Newcastle's visit to the Emirates Stadium.
The in-form goalkeeper was unable to play in Monday's 1-0 defeat to West Bromwich Albion at The Hawthorns because of illness.
Karl Darlow instead made his Premier League debut for McClaren's relegation-threatened side.
And Elliot – who has been outstanding in recent weeks – was sent home today after he again complained that he felt unwell.
Head coach McClaren said: “He was sent home again today, but we are hoping in the next couple of days he gets over it and he is fit for Saturday.
“It's just a family bug, stomach, so he's not feeling too good."
Darlow is on standby to play against Arsenal on Saturday should Elliot fail to recover in time.