The Brazilian joined on a season-long loan from Benfica and came to north London with a thankless task – to deputise for Harry Kane.
As a result Vinicius, who did not speak English when he arrived in the country, has found minutes hard to come by in the Premier League, but has performed an admirable job in the Europa League, scoring six goals and allowing Kane several nights off.
Spurs have an option to buy him for £45million in the summer, which looks unlikely unless he can deliver in the Premier League in the coming weeks.
But Mourinho is still impressed with how Vinicius has adapted to life in England.
"He has one problem, and the problem is Harry Kane. It's as simple as that," he said.
"You need to be a special guy, you need to be a special heart, a special mentality, a special feeling in relation to what you mean for the team, what the team expects from you.
"To be a striker in the same team as Harry Kane then you need to be a special guy, always motivated, always happy to have one minute, five minutes or start the game.
And Mourinho is full of praise for Clarets boss Sean Dyche, who is the longest serving manager in the Premier League.
"He is doing amazing. I think he has the power to decide to make decisions, to choose the players in relation to what the club can give him, in relation to his philosophy," Mourinho said.
"He knows the profile of football he wants to play, the profile of team he wants to have. He knows how to get the number of points that season after season after season – they keep them always far from the dangerous position.
"Don't forget they qualified for the Europa League. Just amazing work he is doing, good professional. I am very pleased for the work he is doing."