And finally, Paul Scholes believes his old club won't challenge for the Premier League title this season due to club's hard summer.
United officials believe there are differences in that Mourinho was coming off the back of winning titles at Real Madrid and Chelsea ahead of those respective departures.
Not much has been heard from the French World Cup victor since then although there were whispers that he was placed on a shortlist by Manchester United management as a backup should Mourinho decide to depart Old Trafford.
Lingard missed United's 2-1 win over Leicester City last week having just returned from holiday following the 2018 World Cup, while Lukaku was only a second-half substitute against the Foxes due to his limited fitness.
United finished 19 points behind champions and cross-town rivals Manchester City in the league last term and Scholes, who played more than 700 matches for United, said the club are lagging behind City and a strengthened Liverpool this season and does not see Mourinho's side eclipsing their rivals.
The Portuguese manager had warned United's board the club could face a "difficult season" if the squad was not improved.
TUKO.co.ke earlier reported that Martial was left on the bench in United's Premier League opener at Old Trafford against Leicester City.
However, French publication L'Equipe claims Zidane could sensationally become Manchester United's next head coach with growing uncertainty surrounding Jose Mourinho's long-term future.