Kai Havertz scored the only goal of the game in the 37th minute.
Since joining City, Guardiola has led the Cityzens to 17 major trophies and 20 in all.
The home side regained the lead after an error from Szoboszlai, who slipped as he attempted to control a throw-in.
Oliver Glasner’s side now sits 15th in the Premier League table with a difficult schedule ahead.
The company’s finance and strategy director, Mayank Kabra, disclosed this during a media parley on Wednesday in Lagos.
The late strike marked the third time Everton have conceded in stoppage time this season.
Young’s football journey began at Watford in 2003.
The striker won the spotkick after he was brought down inside the 18-yard box.
The goal was Sesko’s 10th league goal of the campaign.
Man City will face the winner of the Chelsea-Leeds United semifinal next month.
