The 18-year-old made his debut for the Red Devils in a 2-1 loss away at Stuttgart back in October 2003.
“That is the question now. Is Cristiano Ronaldo going to be enough to make Manchester United champions this season?”
Pochettino stated that it took a while to process that the club had signed the six-time Ballon d’Or winner.
He is expected to feature when they take in a trip to Brest for their next Ligue 1 outing on August 20.
Lacazette has one year remaining on his Emirates Stadium contract and is apparently open to joining Barca.
The France forward is set to team up in the Paris attack with Neymar and Messi.
Barcelona are reportedly on the brink of confirming a new two-year contract for Lionel Messi.
City’s record goalscorer announced earlier this season that he will leave the club when his contract expires in the summer.