Keita became the club's record buy when the Reds agreed to a €60 million transfer a year ago, but to the deal's unique structrue, the Guinean only arrived in the summer of 2018 to bolster their midfield.
The 26-year-old joined the Reds on a free transfer from Burnley in the summer of 2015, but he has desperately failed to establish himself at Anfield, making just six Premier League starts for the Merseyside outfit.
"Hendo is so important to us, not only as a player but also as a person and as a leader", Klopp told the Liverpool Echo.
"It helps not only Loris, but Alisson as well that you can see this very special place".
After such an early flurry of action, the goals dried up temporarily.
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A hard-working and popular member of the squad, Ings nonetheless saw his game time at Liverpool restricted once more last season. The Spaniard later admitted he had no choice but to "wheel and deal" in the transfer market .
Henderson helped England to reach the World Cup semi-finals in Russian Federation, which meant he only returned to training on Sunday.
"Dejan (Lovren) is in but he's not had a long holiday (after the World Cup final). I still remember the Burnley game (at Turf Moor in August 2016) when we lost 2-0 with 80 per cent possession".
Klopp will be happy with the desire that Grujic is showing to fight for his position but that may prove to be very hard, with the Reds having good quality already in midfield.
After victory over Torino, the German said: "We will see".
"Maybe we will do some magic things with the formation on Tuesday. He's been brilliant for that back four, he's made everyone look better".
With West Ham visiting Anfield for the Premier League opener on Sunday, Klopp withdrew most of his first string, giving run-outs to the likes of Daniel Sturridge, Adam Lallana, Danny Ings and Marko Grujic, along with another off-season recruit, Xherdan Shaqiri.