It was the first game back with United for Pogba after his World Cup-winning exploits, and he said it was challenge to find his form before eventually giving way to substitute Marouane Fellaini in the 84th minute.
Having returned from France's triumph in Russian Federation last month to intense media speculation about his future under United manager Mourinho, the 25-year-old Pogba was named skipper of a team that included debutant Fred.
Showing few signs of rust despite only returning to training this week, the World Cup victor, wearing the captain's armband, impressed in possession and without it, leading by example and keeping his cool from the spot.
"The players from a year ago are responsible for the excitement, and then we brought in a few new players as an icing on the cake", Klopp said during the club's promising preseason tour in the United States. "All my players did not have 90 minutes in their legs and bodies".
With only a few minutes gone defender Amartey handled in the box and Pogba, after a stuttered run up, hit the ball over Schmeichel into the top of the net.
United never got into full flow in attack but when they did threaten, it was down Leicester's right.
Mourinho has repeatedly called for more backing in the transfer market if United are to close the record 19-point gap they trailed Manchester City by last season despite finishing second in the table.
Why Paul Pogba could still transfer from Manchester United to Barcelona after deadline day
United had been interested in signing Harry Maguire this summer, but Leicester's steadfast refusal to sell scuppered any move for the England star.
With Puel having a lot to ponder on the right-hand side, he will be happy that the left seems to be in order.
However, the Chilean winger looked like a shadow of what we know he can be. Since then, he's fallen out of favor at times at United under Mourinho and was unable to sustain consistent playing time.
"I expect a better United than last season".
According to reports, United were ready to spend big on a world-class defender, with a £100million move for Raphael Varane considered before Real Madrid made it clear that the France global was not for sale.
Mourinho's men were looking to sign a center-back on the deadline day but the failure to do so has summed up what has been poor business from the Premier League giants.
The 25-year-old striker looks set to lead the line for years to come.
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