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The seven-time world champion is making a comeback following his retirement in 2012.
Shaun Rooney's goal won the cup for the Perth side.
The St Johnstone boss admitted to being emotional after his side lifted the trophy.
St Johnstone will wait to fully celebrate the League Cup win.
Two surprise packages meet in the League Cup final at Hampden.
Motherwell were 2-0 winners at Easter Road.
The Celtic interim boss says there is "no doubt" clubs will want Ajer.
Hughes felt St Mirren should not have been awarded a decisive penalty.
Kilmarnock ended their losing run but the manager felt they could have had more.
Robertson and Cole were on the scoresheet at Easter Road.
St Mirren struck late to claim a vital win in Paisley.
John Kennedy had the perfect start to his spell as interim manager.
Zech Medley levelled for the hosts to make amends for an early mistake.