Liverpool boss Brendan Rodgers is upset Moussa Sissoko escaped red during defeat at Newcastle United.
Sissoko was booked for a foul on Joe Allen, but didn't see red and later set up Toon's winner.
Liverpool boss Rodgers said: "Sissoko's challenge on Joe should have been a sending off.
"Sissoko is running back and jumps in and Joe was lucky.
"His foot was planted and it could have been an horrendous challenge.
"Overall we have no complaints how the game was handled apart from that tackle."
