Footage shared online shows that Jordan Pickford was seemingly caught up in a pub brawl on Sunday night.
Videos have emerged on Twitter that shows the Everton and England goalkeeper being held back by a crowd after a fight broke out in Sunderland last night.
Pickford appears to take a swing at someone as a large group scrap outside a pub.
The 25-year-old eventually gets led away.
A spokesman for Everton Football Club said: "The Club has been made aware of an alleged incident involving one of our players and we are looking into the matter."
They added they will offer no further comment on the matter until they have established the content of the video.
They will speak to Pickford to establish whether he was involved in any incident.
But videos from earlier in the day shows Pickford wearing that same white jumper.
Pickford was in Sunderland as his former side lost in the Checkatrade trophy final to Portsmouth in penalties.
Sunderland had led 1-0 and 2-1 but Lee Cattermole’s missed penalty saw Pompey triumph at Wembley.
Twenty four hours previously, Pickford had kept a clean sheet as he helped Everton beat West Ham 2-0.
That win lifted the Toffees into ninth, one point behind Wolves in seventh as Marco Silva's side look to finish the season strongly.
On the pitch, Pickford has had a few difficult moments with a horrible mistake in the Merseyside derby back in December.
In injury-time, he attempted to push the ball over the crossbar but only managed to tip it against the bar and onto the head of Divock Origi.
Then during last month's clash against Newcastle, Pickford was at fault for all three goals Everton conceded as they went from 2-0 up to 3-2 down in the second half.News Now - Sport News