Manchester United shelled out over £150million on the likes of Paul Pogba, Henrikh Mkhitaryan and Eric Bailly last summer.
They also landed Zlatan Ibrahimovic on a free transfer worth £250,000 a week.
United have been backed to splash the cash again this summer with Atletico Madrid star Antoine Griezmann reportedly their chief transfer target.
And Mourinho has confirmed Ed Woodward's claim that the club will stop "churning" players in future transfer windows.
Jose Mourinho has hinted at another summer spending spree
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"First of all, yesterday I had to ask a friend about ‘churn’ because I had no idea," Mourinho joked ahead of his side's clash with Watford tomorrow (3pm).
"It’s a new word for my vocabulary. You have to learn every time you can, and I thank Ed for that word because I didn’t have an idea.
"He’s completely right, of course we speak about it, of course we speak about what next and we know that we have a squad that, like every squad, needs changes, but we know also that our squad has potential, our squad has good players, many of them in the best age, the age of evolution."
Mourinho also confirmed that money would be no object to the club.
Manchester United broke the bank to land Paul Pogba last summer
Pogba alone cost a world-record £89million fee to re-sign from Juventus.
And Mourinho has hinted the club aren't opposed to spending big if a player suits their requirements.
"It’s not our philosophy, independent of the numbers, if you can spend £1m, £10m or 100m," the former Chelsea boss added.
"It’s also the philosophy, the idea and we look at it in this way.
Antoine Griezmann has been backed to move to Manchester United this summer
"We prefer to bring two, three or four players, players that feel an idea, a football we try to play, that can improve our squad.
"We’re not interested in signing six or seven or selling six or seven, we’re not going to play this game.
"We’re stable, so we think our market in the summer will be soft, will be natural, some players to leave, some players to come, but in a very natural way, so I think the word Ed used was a good one."