Sturridge has made just six starts in the Premier League this season, and 26 appearances overall, with his minutes limited by injury.
But he has still scored seven goals, including one in his first league start since January 2, when Liverpool sealed a 4-0 win over West Ham last weekend.
This has led to widespread calls for Klopp to retain the England international ahead of a summer that will reportedly see him depart the club after four-and-a-half years.
However, the German rightly stressed misgivings over the No. 15’s fitness were the cause of his peripheral role.
“A fit Sturridge is an unbelievable player. That’s a pity of the situation, [it’s] not often enough,” he continued.
“But he’s now fit, spot on, trained two or three weeks.”
Based on Sturridge’s performance at West Ham alone, there should be no doubt over his long-term role at Anfield.
But that this is his third successive season disrupted by regular injury problems remains a major concern, and it is clear why the more robust Firmino is preferred.
Speaking after the victory at the Olympic Stadium, Sturridge also suggested he would be open to staying with the Reds beyond the summer.
“I’m at this club, I’m enjoying my football when I play,” he explained.
“The manager’s shown faith in me, we have a good relationship as well, the fans have been different class.
“So we’ll see. I don’t have any worries about next season.”
Sturridge is likely to start in Liverpool’s last game of the campaign at home to Middlesbrough on Sunday, with Firmino still a doubt.
This could give him the chance to further underline his importance to the Reds, or provide him with an opportunity to wave farewell to supporters after 119 games.