Liverpool manager Kenny Dalglish admitted he was baffled by Martin Atkinson's decision to award a penalty late on against West Brom.
The Reds' revival was halted at the Hawthorns by Roy Hodgson, who Dalglish replaced in January in the Anfield dugout, as they lost 2-1 thanks to two Chris Brunt spot-kicks.
No complaints were made about the first, but when Peter Odemwingie was brought down by Pepe Reina for the second, Atkinson appeared to wave away the decision before it was given by his assistant.
In an incident that echoed the one that benefited Liverpool two weeks ago at Sunderland, when Jay Spearing was fouled and received a penalty through the linesman's advice, Dalglish conceded that there needed to be more communication.
"We took the lead then they got themselves back in it with two penalty kicks," he said.
"You can argue whether they were or weren't penalty kicks but I think somebody needs to explain to people to make it clear why sometimes the referee gives it and why sometimes it depends on the linesman.
"We were the benefactor of that a couple of weeks ago at Sunderland when the linesman gave it against the referee. Sunderland felt aggrieved, we just felt bemused.
"If somebody just tells us why, I know they are meant to be there to help the referee, but they need to explain how they came to the decision, whether they're throw-ins or whatever.
"So you can argue whether they weren't or were penalties but the fact of the matter is they were given by two different people.
"Communication is always beneficial to everybody, the more you talk, the more you understand it. Maybe if we did understand we would know why. But maybe they have had the discussions at the start of the season before I came in.
"But I don't know when the authority goes to the linesman rather than the referee, and it would be helpful if we did know, just to explain things recently."
Dalglish suffered a double blow early in the game as defenders Glen Johnson and Daniel Agger were forced off through injury, meaning the Reds had to field young Scot Danny Wilson and Sotirios Kyrgiakos, who was tormented all day.
But the Scot insisted that they just had to deal with the problem, also stating that he did not know the extent of their injuries or that of skipper Steven Gerrard, who was hurt again in training as he attempted to return after groin surgery.
"The players coming out there are in their squad, so they must be capable players and deserve to play," he added.
"They did look a bit leggy, but West Brom had 14 players away, and they looked a wee bit short as well.
"We've lost Steven before the game, lost Glen and probably Daniel Agger as well so we just need to get on with it and do the best we can with what we're left with.
"It's just too early to tell what the extent with the injuries will be, we'll wait and see. Glen looked like a hamstring strain and Daniel looks like he's done some damage to his tendon behind his knee, but both of them innocuous.
"Steven got injured in training, we'll just assess it, we'll know later on in the week how he is and what the damage is and the length of time."