Last updated on .From the section Everton
The Professional Game Match Officials limited will be contacted by the club to find out why the challenge that led to the penalty was not reviewed further.
Anthony Gordon went over in the area after a challenge by Matip.
Andy Robertson scored the opener eight minutes after the incident.
With six games left in the season, the team is in the bottom half of the table.
The final position of safety is still up for grabs as the Toffees have a game in hand.
If the challenge had been made on the player, a penalty would have been given.
He said that it was a penalty and that it was not possible to get them at Anfield.
If that was at the end of the game, I think the referee gives that. It was a foul on Anthony.
In the Manchester City game, Rodri appeared to use his hand to control the ball, despite the fact that he was denied a penalty.