According to The Sun, the Portuguese boss has become the subject of interest from one keen fan in particular.
They claim the woman regularly attends matches as a photographer and security staff at Old Trafford are on alert over her entering the stadium.
Manchester United have instructed their security staff to stop her from coming into the club's training ground and have urged staff to be vigilant at The Lowry Hotel, where Jose Mourinho is currently staying.
Jose Mourinho is reportedly being stalked by an Italian woman
Jose Mourinho and Jurgen Klopp in heated exchange during Old Trafford stalemate
Sun, January 15, 2017
Jose Mourinho and Jurgen Klopp appeared to have a war with words during Manchester United's stalemate with Liverpool
1 of 7
Klopp and Mourinho appeared to have a heated exchange on the touchline
The report suggests the crazed fan has been stalking Mourinho since his time at Chelsea and perhaps even further back.
A source told the paper: “The issue dates back to his time at Chelsea and possibly longer.
“She’s very persistent and appears to have the hots for him.
“She works in the media and has previously been granted accreditation for matches.
Get Quotes on Home Insurance
Jose Mourinho was reportedly stalked by the same woman at Chelsea
Jose Mourinho's Manchester United sit sixth in the Premier League
“She always seems very keen to speak to Jose, to the point where it’s a bit odd.”
While United's security team take care of the matter, Mourinho's focus will be on preparing for their trip to Stoke on Saturday (3pm).
The Red Devils sit sixth in the Premier League table, 12 points adrift of leaders Chelsea.