The EFL is said to be 'under pressure' from its clubs to investigate the circumstances which led to Liverpool's Carabao Cup semi-final first leg with Arsenal being postponed.
Jurgen Klopp's side were due to take on the Gunners at the Emirates last Thursday, though the match was called off after Liverpool concerns over a number of positive coronavirus tests within the camp which caused the AXA Training Centre to be temporarily closed a day prior to the scheduled first leg date.
Liverpool submitted the postponement request "due to an escalating number of suspected positive COVID-19 cases and player availability".
The Reds' application to call off the game was approved by EFL, though they are now facing calls to provide clarity on the situation on the back of Klopp's comments after beating Shrewsbury Town.
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The Liverpool boss indicated all but one of the new positives were in fact 'false positives', which has 'upset' certain EFL clubs according to an Athletic article.
Their frustration is said to relate to the EFL turning down postponement requests due to similar COVID-19 issues and being made to play on.
The Athletic suggested Liverpool could be hit with a 'severe punishment' should the EFL find that they failed to fulfil a fixture without just cause.
But the report also claims Liverpool underwent "at least two rounds of testing prior to the postponement" including PCR tests "carried out by an independent laboratory". Yet an apparent third set of tests "conducted after the scheduled first leg" gave numerous negative readings.
Explaining the 'false positives' and how things unfolded, Klopp told reporters on Sunday: "The situation is just like this: We had what we thought last week was a proper outbreak and it showed up that we had a lot of false positive results actually.
"But the rules are like they are so all these players who are false positives couldn’t play today [against Shrewsbury]. Or we decided not to play them or whatever.
"Could we have played them? I don't know exactly but we had to make that decision.
"The only real extra positive from the team came from Trent Alexander-Arnold and all the rest were false positives, so it was a really tough week because the boys couldn’t train.
"We had to close the training ground because you have two extra testing grounds, so it's really difficult.
"It was very difficult for a few reasons, but, like I said, this was the team we could line up with today and the boys did really well."
