The Tottenham Hotspur manager worked alongside Age UK and Love Your DoorStep in Enfield to prepare food parcels and other items for delivery to the more vulnerable members of the community.
"I am here to help Age UK Enfield, Love Your DoorStep Enfield and of course you can donate food, money or be a volunteer," Mourinho said in a video posted by Love Your DoorStep's Twitter account.
The charity has been delivering essential goods to elderly members of society who have been advised to stay in quarantine for the next 12 weeks.
And Age UK have launched a £10m emergency coronavirus appeal.
The funds they raise will help support Age UK's national telephone friendship and advice lines, as well as front-line local Age UK support, including food packages.
Elsewhere, Manchester United midfielder Juan Mata offered to practice - once the pandemic eases - with a self-isolating boy from Dublin, whose innovative method of solo goalkeeping practice went viral.
"One day, if he wants, and when all this is over, I would like to practice my freeckicks [sic] with him on goal! What do you think?" wrote Mata.
Goalkeeping legend Peter Schmeichel also shared the video and added: "Nothing, not even an evil virus like the CONVID-19 [sic] should stop a talented goalkeeper from working on getting better. Well done young man."
Crystal Palace forward Wilfried Zaha - who co-owns ZO Properties - offered to open 50 homes in London to NHS staff who are working around the clock.
Gary Neville also announced that the two hotels he part-owns with former Manchester United team-mate Ryan Giggs will be made available free of charge to NHS workers.
Manchester United striker Marcus Rashford partnered with the charity FareShare, which redistributes surplus food to frontline charities around the country, as schools closed on Friday.
"I wanted to understand the scale of the problem and how we can reach vulnerable children," he tweeted. "It's not just schools. It's community centres, breakfast clubs, etc that provide the only meal many kids get each day. No child should have to worry where their next meal is coming from."
And Tottenham defender Toby Alderweireld vowed to buy electronic tablets for hospitals and nursing homes so those with COVID-19 can stay in touch with family members.
"The virus creates many needs, especially the lack of personal contact," he said in a video message. "The people who are sick can't see their friends and family.
"My plan is to buy dozens of tablets to give to the hospitals and nursing homes so people can video chat with their loved ones and friends to get through this tough period."