Christian Eriksen, Erik Lamela, Roberto Soldado, Paulinho, Etienne Capoue and Nacer Chadli are among the new faces recruited in spending a summer outlay of over £100million by the north Londoners.
Mackay said: "The talk all summer was that the Bale deal was happening, but Spurs went out and brought all those players in and then eventually did the deal.
"It looks to be very good business. Everyone knew in football that the players they brought in were top talents who were on the market.
"They were all going to cost quite a lot of money, but the extraordinary money that the Bale deal actually made for the club meant they were able to go and do that.
"The players he already had were a good top-six team, but I think they have strength in depth with the players they have brought in. Some of those players I covet."