It was another limp and uninspiring display from United, who were held to a goalless draw by Valencia at Old Trafford on Tuesday.
Not since opening their Champions League Group H campaign with a 3-0 win at Young Boys have United tasted victory – defeats to Derby County and West Ham, and draws against Wolves and Valencia increasing the pressure on under-fire manager Jose Mourinho amid reports of dressing-room unrest and issues with Pogba.
The stalemate also set a new unwanted record for Mourinho , who has failed to win any of his last four home games for the first time in his managerial career.
But Pogba turned to social media to ask him team-mates to "keep fighting" even as they struggle to find their form.
Star midfielder Pogba – at the centre of a reported falling out with Mourinho – used social media to issue a rallying cry, writing: "Let's keep fighting United #mufc."
Already nine points off the pace in the Premier League, United host lowly Newcastle United in a must-win fixture on Saturday.