Ole Gunnar Solskjaer has said Manchester United are receiving fewer penalties as a result of referees being influenced by rival managers.
United were held to a 0-0 draw by Chelsea at Stamford Bridge after referee Stuart Attwell opted not to give the visitors a 14th-minute penalty following a handball incident involving Callum Hudson-Odoi which he was asked to look at on the pitchside monitor.
Former Chelsea boss Frank Lampard and Liverpool manager Jurgen Klopp had previously questioned the number of spot-kicks United have been awarded.
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Klopp claimed United "had more penalties in two years than I've had in five-and-a-half years at Anfield.