Allegations of financial impropriety off the field couldn't derail Manchester City moving to the brink of the Champions League last 16 as Gabriel Jesus scored a hat-trick in a 6-0 thrashing of Shakhtar Donetsk on Wednesday.
A hard start would also aptly describe how Lindelof fared United after leaving Benfica previous year.
"Lukaku is training with the team this morning", Mourinho told a news conference.
The Portuguese coach still regrets the club's failure to sign Perisic - with CEO Ed Woodward reportedly refusing to stump up an extra £5m - and believes his skillset would have been a better fit.
United were the last team to win a Premier League game at the Etihad Stadium and, despite a mixed start to the season, will head there full of confidence after fighting back against Bournemouth and Juventus to win both games 2-1.
"No team wins in Turin in the last nine years, how strong Juventus are", Guardiola said of United's eye-catching result.More news: California fires: Malibu residents ordered to evacuate
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"We have a chance that Lukaku could be back", said the United boss.
"We are always ready to compete and need to take advantage of the good momentum of the team at the moment. The top teams, you can not imagine and think about it, play amazingly for 90 minutes and they don't have chances".
"If you want to put the match into the context of where we are and where we can be, it becomes even more hard".
However, Juan Mata's free-kick levelled the score, and Alex Sandro's own goal in the 89th minute secured all three points for the Red Devils and boosted their hopes of reaching the last 16 of the Champions League.
"They have incredible talent up front and in the middle as well".