United were stunned by Crystal Palace as the south London side won 2-1 at Old Trafford.
Goals from Jordan Ayew and Patrick van Aanholt guided Palace past United.
David De Gea was at fault for Palace’s winner, with the Spaniard failing to stop Van Aanholt effort.United also missed another penalty after Marcus Rashford failed to score from the spot.
And United boss Solskjaer has hit out at his players, claiming they didn’t test Palace enough.
Solskjaer told Match of the Day: “They scored 2 and we scored only one.
“We just were not clinical enough in front of goal and they scored two very easy goals.
“I thought we got our act together second half, we just couldn’t hit the target.
Two games, two missed penalties,” Solskjaer added.
“It’s part and parcel of it. Sometimes it happens. I have missed a few myself.
“If we score them it’s a different story. If we keep putting ourselves in those positions we will get more penalties and we will score.
“It is just one of those things. We trust them to score again.”