Giggs was appointed in a caretaker role on Tuesday after David Moyes was sacked less than 12 months into his six-year deal and with, Saturday's home clash against Norwich City fast approaching, the veteran summoned his long-time team-mate to help.
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Butt coaches the club's Under-19s team and Scholes has assisted in their European campaign.
Neville remains part of the club's first-team staff despite the departure of Moyes, with whom he also worked at Everton.
Along with Gary Neville, the four members of the 'Class of '92' agreed a deal in March to buy non-league club Salford City FC together.
United are languishing in seventh in the Premier League table, 23 points behind table-toppers Liverpool and with their hopes of Champions League qualification extinguished.