Arne Slot says he took Ibrahima Konate off in the second half against Chelsea because of an injury scare for the Liverpool defender (though it was a change he might have made later in the game anyway).
"What I do know is that he limped," Slot said. "He felt his quad a little bit. For me, alarm bells go off because in another sprint, you never know. It was already a sub I had in mind for a little later.
"It might be OK that he went off early enough, but it was clear I had to take him out because he was limping."
Liverpool lost the game late in stoppage time when Estevao popped up at the back post. The Reds have now lost three games in a row in all competitions, also coming unstuck against Crystal Palace and Galatasaray.
"We were the dominant team but in the last 10-15 minutes it was end to end," Slot said on Sky Sports.
"Both teams could have scored. Both teams arrived a lot of times at the 18-yard line. These are the margins that don't fall for us at the moment.
"We have to work harder to not rely on these margins. As I said, Chelsea, Palace away, these are also teams that ask you a lot of questions."