Liverpool beat Newcastle 3-2 at St James’ Park to go back top of the Premier League table.
At first glance it appeared to be Divock Origi to head home the winner, but replays showed it in fact came off Magpies captain Jamaal Lascelles.
But Souness says the initial free kick which led to the goal should not have been awarded.
Newcastle winger Matt Ritchie was deemed to have fouled Fabinho but Souness claimed the officials got the decision wrong.
“The goal, the free kick leading up to the winning goal shouldn’t have been given,” he said on Sky Sports.
“Matt Ritchie will be cursing this. Watch this from several angles.
“We’ll see it, there it looks a foul, but watch it from the next angle.
“How that linesman can give it, watch this. You don’t fall like that.