The Red Devils have lost their last three Premier League games following defeats by promoted sides Bournemouth and Norwich City before their Boxing Day humiliation at Stoke City.
Chelsea scored a late equaliser to deny Watford a famous victory in a 2-2 draw at Stamford Bridge which left the Blues just two points above the relegation zone.
Ferdinand, who called time on his United career in 2013 after a distinguished 11 years at Old Trafford, wants the Red Devils to give everything against the Blues this evening.
Ferdinand wrote on his Instagram page: “Looking forward to being back at OT today for @manchesterunited game against Chelsea!! Huge win needed.. Shackles off! #mufc 🔴⚽️”
United are in sixth place and nine points behind Premier League leaders Leicester City.
The Red Devils have failed to win their last seven games in all competitions since a 2-1 win against Watford on 21 November.
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