It was indicative of the approach of the two managers that United's Jose Mourinho sent on defensive midfielder Marouane Fellaini at halftime with the score at 1-1, while Liverpool's Juergen Klopp turned to Shaqiri when that score had not changed midway through the second half.
Many fans hoped Keane's words would launch a verbal rocket up the backsides of the players searching for a first away win in the Champions League in two years and a first away goal in a year, and the United fans sang the name of their injured captain before, during and after the game.
The Frenchman, who lifted the trophy with Real Madrid as a player in 2002, had also guided the Spanish giants to Champions League glory in 2016 and in 2017, beating Atletico Madrid and Juventus in the respective finals.
United reached the last 16 in the Champions League, where it will play Paris Saint-Germain over two legs in February and March.
It remains to be seen who made the decision first to post and then delete the message, but it is safe to assume Pogba is not disappointed by Mourinho's exit at United. But still I see chances for us.
Jose Mourinho admitted Liverpool were too good for his Man United side on Sunday, following a thrilling 3-1 win for the Reds.
In an official statement on the club's website, the club said a caretaker manager will be appointed until the end of the current season, while the club conducts a thorough recruitment process for a new, full-time manager.
Zidane is available having left Real Madrid in June after winning his third successive Champions League with the club.
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They're world-class players. they've got ( Paul) Pogba , (Romelu) Lukaku, (Juan) Mata, (David) de Gea, they've got world-class players.
Mourinho was paid £15m-a-season and has ploughed his way through more than £300m on big name signings in the last 24 months, but been unable to mastermind a significant title challenge.
The club will be liable to pay that Champions League stipulation until the club are out of the competition and also mathematically unable to compete for next year's iteration.
But that was as good as it got for the Portuguese, who was contracted until 2020 with the option of an extra 12 months.
However, despite his protestations to the contrary the United board gave Mourinho plenty of money to compete.
"If you play only with 80 per cent, you can lose a game, so you have to be always 100 per cent and we manage that very well".
Roberto Firmino was at the center of Liverpool's maelstrom, hustling and harrying opposition players while delivering cutting interventions going forward. Who is it that is telling Jose Mourinho that those players shouldn't be signed?
"We can not compare with their intensity", Mourinho said, "we can not compare with their physicality".
August 27, 2018 - Defeat at Brighton in the second game of the season is followed up by a 3-0 loss at home to Tottenham - the worst home defeat of Mourinho's career.