The Frenchman and World Cup winner was an unused substitute as the Red Devils breezed past Fulham in a 4-1 win at Old Trafford.
Mourinho was impressed with his team, including Romelu Lukaku, Marcus Rashford and Diogo Dalot, who all shone against the Premier League's bottom side.
But when pressed on Pogba's situation, Mourinho seemed relaxed and suggested he will be back in the first team.
Mourinho said: "He has to play with the same mentality as the team playing with.
"Paul can be a fantastic player, he has the potential to be a fantastic player.
"Against Valencia he is going to start and against Valencia he is going to have a fantastic game to play and show everybody how good he is."
Pogba came off the bench against Arsenal to play the final 16 minutes.
BRAND NEV STAR Diogo Dalot showed why he is Gary Neville's heir for Manchester United against Fulham
But Mourinho was not happy with his lacklustre performance against Southampton as United let in two early goals to come back in a 2-2 draw.
United can still win their group, but are two points behind Juventus, who travel to Switzerland to face Young Boys on Wednesday.
There is no doubt Pogba has had a dip after his long summer in Russia and an injury that kept him out of the Manchester derby.
However, if they are to get into the top four, and push on in the last 16 in Europe, then Pogba needs to be at his marauding best.
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