Liverpool boss Jurgen Klopp says he does not pre-plan his substitutions.
The Reds coach has been ringing in the changes around the 60th minute in several games recently.
While Klopp will rotate his team as they take on Benfica in Wednesday's Champions League quarter-final second leg, as they are up 3-1 from away leg, he is not mapping out substitutions just yet.
He told reporters: "No. It's rather a logical time. Half-time you could do as well but there is no real need for it. In these competitions we have to make these changes just because we come out of a very intense period and we have to be 100 per cent sure that we can keep our performance level over 90 minutes or 95, whatever.
"We are in April, so the boys have already 50 games in their legs. We are in April, so we have to make these changes early. Is 60 minutes early or not? I don't know but it's half an hour [left]. You can be really influential in half-time. But it's not pre-planned that we say, '60 minutes, now go.' If you are in the 58th minute you might rather wait for the sixties, I don't know. I don't even look properly at the watch."
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