"The Premier League Board has written to Wolverhampton Wanderers to request their observations in relation to the team fielded in their League fixture against Manchester United," the statement read.
"Once the observations are received the Board will decide whether any further action is warranted."
"I took the decision knowing full well that questions would be asked and was has happened is that we've come out tonight without any more injuries," McCarthy was quoted as saying on the club website.
Only goalkeeper Marcus Hahnemann survived from the side which recorded a surprise 1-0 victory at Tottenham Hotspur last weekend leading some Wolves fans to chant "we want our money back" during the United match.
"I read an article somewhere how (Chelsea manager) Carlo Ancelotti had said that the risk of injury in one game is 10 percent," McCarthy said.
"And then that goes up to 30 or 40 percent if another intensive game follows in three or four days. We believe that anyway..."
"That was the best team available to me tonight because it was fresh legs and I thought we were as competitive tonight as we were against Chelsea and Arsenal."
