Johnson is set to test his managerial wits against Mourinho in tomorrow’s Carabao Cup quarter-final clash (8pm).
He hopes to chat with his Manchester United counterpart after the final whistle.
And Johnson plans to “seduce” Mourinho to his office by offering him some plonk.
Johnson said: “I’ve purchased an extremely expensive bottle of wine that I’ve heard he likes – Portuguese red – so hopefully he’ll get the message and I can seduce him into the office and chat a little bit about football and pick his brain on one or two things.
“I’ve got to be honest, in the technical area he’ll just be another manager and it’ll just be a case of my competitive nature and the players will try and outgun what is world-class opposition both in the technical area and on the pitch.
“It’s something that we’re looking forward to but we won’t be in awe of and we won’t fear and everything we do will be about trying to progress the club into the next round.
“It’ll be tough, it’ll be difficult but we’ll give it our best.”
When asked if the bottle of wine means he won’t able to buy his daughter a Christmas present, Johnson joked: “Well I had to raid her piggy bank so she’s going to miss out on more than a Christmas present but it might be worth it because I’m going to ask him for free loans while I’m there.”
Johnson’s side are flying high in the Championship table – a far cry from the relegation scrap of last term.
A number of Robins fans wanted the 36-year-old sacked as they flirted with the drop but owner Stephen Lansdown stuck by his man.
Johnson has crafted a youthful team that play with a swashbuckling style and he is eager to see how they match up against some of the world’s best players.
“We’ve got a group that is very hungry to prove how good they are,” he said.
“It’s a chance for the players, the club and the supporters to enhance their reputation. There’s minimal pressure involved apart from the pressure we put on ourselves. It’s a big challenge to see whether or not we can cope with Premier League football.
“I’m sure they [United] can handle pressure, the players and the manager are world class so they’ll be confident enough in their abilities for a trip to Ashton Gate, but this place is a difficult place to play.
“This will be an unbelievable atmosphere.”