Like Cardiff Middlesbrough won 2 and drew 2 of the four League games played during September. Boro though conceded no goals in those four games and remain unbeaten this season after ten matches.
Mackay was shortlisted along with Southampton's Nigel Adkins, Hull City's Nigel Pearson as well as the eventual winner Mombray.
Joe Ralls was also recognised this week when Sky chose his goal at Hull as one of the goals of the week.