The former Chelsea manager was seen at a first match since his sacking by the Blues on New Year's Day.
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Maresca was spotted in the directors' box of Leicester, watching their 2-0 Championship defeat by Norwich City.
The Italian led Leicester to promotion to the Premier League two years ago before leaving for Chelsea.
Sitting alongside Maresca at Leicester was Willy Caballero, who was his assistant manager at Chelsea.
The result yesterday leaves Leicester third from bottom, one point away from safety.