The Chile global did not travel with the squad to the south coast, BBC Sport reports.
The 29-year-old German worldwide will be free in the summer as his contract is due to expire. Probably this weekend he is going to defend Arsenal colours so I don't think it's correct to say things about Alexis Sanchez.
"Let's say we have three targets in the summer - a defender, a midfielder and an attacking player", Mourinho told reporters.
According to The Express, however, United fear that their interest in the striker is being used by the Gunners as a bargaining chip to get City to increase their £20m offer.
"I understand completely why you ask this question (about Sanchez), it's your job", said Guardiola.
The report also suggests Mourinho was unwilling to enter the race to sign Sanchez in the previous transfer window in an attempt to avoid becoming embroiled in a summer-long battle for the Chilean's services. "If you buy Alexis Sanchez with a normal price maybe 80 or 90 million euros".
Sanchez nearly joined City for about £60m on the final day of the summer window, only for the transfer to collapse when Arsenal failed to sign Monaco and France midfielder Thomas Lemar. Under Mourinho, it's hard to say if Ozil would score more points or fewer.
"If you look back at Man Utd's big signings over the decades, Cantona came out of the hat, [Robin] Van Persie was a surprise, and they both helped United win titles".
Diego Martinez, whose Twitter profile claims he has written for March and Mundo Deportivo, tweeted earlier this evening that Arsenal had reached an agreement with Sanchez's agent, Fernando Felicevic, and that the move was completed.
With Antoine Griezmann too lurking around in the Red Devils' radar, Ed Woodward is reportedly determined to introduce a global superstar to Old Trafford by the end of the season.