Manchester United manager Jose Mourinho was a late addition to Team Shearer for Saturday's Game 4 Grenfell at Loftus Road.
The charity match was being held in London in order to raise money for the survivors and the community of Grenfell.
Mourinho was not barking orders on the touchline but is expected to play as a goalkeeper during the second half.
The Portuguese Manchester United boss quit professional football as a youngster in order to focus on coaching.
It proved to be a wise decision with Mourinho racking up countless trophies at Porto, Chelsea, Inter Milan and Real Madrid.
In March, BBC pundit Shearer criticised the Manchester United manager's demeanour.
"When he first came into the Premier League, he was a breath of fresh air," Shearer wrote in his Sun column. "He was smiling, he was witty, he was arrogant but in a good way. Now, he is always frowning, scowling and seems to want to row with anyone and everyone.
"He's miserable," the Premier League's record goalscorer added.
"Now I just see a grumpy man, even though United are in a positive place."
The former Newcastle United manager recently broke his arm so was unable to take part in today's Game 4 Grenfell.
He gave the pre-match team talk and took a cheeky dig at Mourinho to the delight of everyone in the dressing room.
Sir Alex Ferguson is widely considered the greatest manager of all time, winning an incredible 13 Premier League titles during his time at Manchester United.
The Scottish manager retired in 2013 and the Red Devils have recently begun playing some decent football after four years of mediocrity.
David Moyes and Louis van Gaal were both given the axe and Mourinho appears able to succeed where they failed.
The former Chelsea boss said: "I would like next manager to find a much, much better club and team than one I found at every level."
"I found a sad club [here]," Mourinho said back in March.
"Man Utd sold players that I would never sell, bought players that I would never buy.
"I would never sell Di Maria, Chicharito [Hernandez], Danny Welbeck. Never. No chance."
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