Daizen Maeda was sent off as Celtic suffered a thumping 6-0 defeat against Atletico Madrid to leave them adrift in their Champions League group.
Celtic were already trailing to Antoine Griezmann’s deflected goal when Maeda saw a yellow card upgraded to a red following a VAR review midway through the first half at the Estadio Metropolitano.
Alvaro Morata and Griezmann both netted doubles and Samuel Lino and Saul Niguez scored as Atletico capitalised on their numerical advantage in devastating fashion with a string of spectacular second-half goals.
The damage was done when Maeda left a foot dangling as he went in for a 50-50 challenge with Mario Hermoso, who rolled around on the floor after being caught on the shin as he followed through. Atletico boss Diego Simeone and six or seven of his backroom staff raced off the bench after the incident, sparking an angry reaction from Celtic manager Brendan Rodgers when the referee was called to his monitor.
Rodgers was booked for dissent as Simeone dragged one of his colleagues back from confronting the Celtic boss. Celtic are now five points adrift of third-placed Feyenoord and, although not eliminated, they will need to beat Lazio and the Dutch side in their final two games while relying on favours from Atletico to have any hope of extending their European run beyond Christmas.