Robbie Savage appeared to aim a dig at Jamie Carragher during TNT Sports' live coverage of Manchester United vs. Athletic Bilbao.
Man United beat Bilbao 7-1 on aggregate to book their spot in this month's Europa League final, which takes place in Bilbao - with UEFA making a decision on moving the location after Tottenham also advanced.
The Red Devils brushed aside their La Liga counterparts 4-1 in Thursday's second-leg, having won the first-leg 3-0.
But Ruben Amorim's side had to come from behind at Old Trafford as Mikel Jauregizar fired home a stunning strike to open the scoring in the second-leg.
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But Man United hit back with four second-half goals, with Casemiro scoring his side's second from a Bruno Fernandes free-kick.
Casemiro found the back of the net from a glancing shoulder.
The veteran midfielder, 33, has resurrected his Man United career, having been subjected to fierce criticism for his performances last season.
Sky Sports pundit Carragher was one of his vocal detractors and urged him to 'leave football' in a scathing assessment.
"Casemiro should know tonight as an experienced player that he should only have another three games left at the top level - the next two league games and the FA Cup Final - then go to the MLS or Saudi Arabia. I’m deadly serious," he exclaimed.
"His agent, the team of people around him, they have to tell him: This has to stop. We are watching one of the greats of the modern times, playing in the best midfields we have seen who have dominated Europe - him holding, (Toni) Kroos and (Luka) Modric alongside him.
"I am nowhere near on what that man has achieved, winning Champions League, playing for Brazil and Real Madrid. But I always remember something when I retired myself, there’s a saying I always remember: Leave the football, before the football leaves you.
"The football has left him at this top level. He has to call it a day and move."
Casemiro has become a vital player under Amorim this season and helped his side reach the Europa League final.
During his goal celebration, Savage seemed to aim a dig at Carragher on TNT Sports commentary.
"Some people were saying he was finished at this club and he has got another goal," he shouted. "A lovely little glance off his shoulder, it doesn’t matter what it comes off. 2-1, Bilbao here they come."
Casemiro has made 39 appearances across all competitions this season, scoring five goals.
He could start against Tottenham in the Europa League final following his recent showings in midfield.
Topics: Jamie Carragher, Casemiro, Football, Manchester United
Nasir Jabbar