Scotland will play friendlies in La Manga, Spain next month against Norway and Iceland before the Algarve Cup, the line-up for which is yet to be confirmed.
Mackay believes the invitation to play there is testament to Scotland’s growing reputation under Kerr.
They have risen to ninth in the European rankings, sit 20th in the world, and recorded their highest home crowd, against Switzerland in Paisley, three months ago.
“Shelley’s come in 18 months ago and off the back of Anna Signeul getting to the Euros, there’s a real resurgence and growth in the women’s game,” he said.
“She’s been very influential, she’s put a national plan in place for the girls’ and women’s game over the last six months and in that period you can see the team has really changed dramatically.
“From the team I watched at the Euros to the one I’m going to be watching at the World Cup, it’s going to be vastly different.”