McStay watched Celtic's 2-1 win against Motherwell on Tuesday night
Willie McStay marked his return to coach Celtic's reserve side with a 4-0 victory over Dundee at Lennoxtown.
All four goals arrived in the second-half from Paddy McCourt, Paul McGowan and Morten Rasmussen (two).
Edson Braafheid, Zheng Zhi and Marc Crosas were among the other first-team stars included in the starting XI.
McStay resigned as head coach of Hungarian side Ujpest last week amid reports of financial problems, having arrived in at the club in July.
McStay left Celtic for Ujpest following the arrival of Tony Mowbray as manager, with reports suggesting the move was part of an international exchange programme.
The brother of former Celtic midfielder Paul, he made 65 league appearances for Celtic between 1979 and 1987 and had spells with Huddersfield Town, Notts County and Hartlepool United.
His 15 years at Celtic, during which they won eight reserve titles in a row, came to an end shortly after Mowbray's arrival.
However, Mowbray was sacked last month, with reserve coach Neil Lennon promoted to interim manager until the end of the season.
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