Manchester United stars are disappointed by Jose Mourinho's treatment of Chris Smalling and Phil Jones.
Ahead of Thursday's derby, Mourinho has twice in the last week publicly challenged the defensive pair to play through pain.
Smalling was accused of lacking bravery following victory at Swansea in November, before it later transpired he had broken a toe.
The 27-year-old is stepping up his rehabilitation after a knee injury sustained last month, while Jones is recovering from a broken toe.