Former chairman Sam Hammam has returned to the club as part of the deal." For our owner to take his plans forward now with a clearer picture massively helps the football club," said Mackay.
Mackay led the Bluebirds to the Championship title last season as the club claimed a place in the Premier League for the first time.
He said the agreement over the estimated £24m owed to Langston, a Swiss-based company, did not mean he would have more money to buy players for the new season, but would give the club a firmer foundation.
"I had a plan that I was working to and this doesn't affect that," said Mackay, who failed to convince Tom Ince to join from Blackpool after an £8m offer was accepted.
"If you're talking about off the field then it's something that needed to happen and it was something that always was going to happen - it was only a matter of time.
"We were relaxed as to the plans the owner's got.
"He quite clearly stated he was going to clear the Langston debt and he's going to put seats in the stadium, and last year he was going to invest in the team to try and get us promoted and to invest in a new training ground.
"They're all things that we've actioned and are happening." The deal with Langston, announced on Monday, clears a debt dating back to the time Hammam owned the club.
As part of the settlement, the Lebanese businessman - who acted as a spokesman for Langston - was made honorary president of Cardiff City.
And he has called for fans - many of whom were upset by Vincent Tan's decision to change the club's colours from blue to red - to give their full backing to the Malaysian owner .