Ole Gunnar Solskjaer has been harshly criticised since being appointed by Manchester United, according to Chelsea head coach Frank Lampard.
The Norwegian was propelled into the job on a caretaker basis last December following Jose Mourinho's sacking and won 14 of his first 17 matches in charge.
But United's form turned after he was handed the top job on a permanent basis as they ended the 2018-19 campaign with one win in nine matches, leading to some questioning the decision to hand him the role full-time.
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Ahead of Chelsea's opening-weekend trip to Old Trafford, however, Lampard insisted the criticism Solskjaer has faced is not justified.