Having secured a 2-0 victory over Porto last week at Anfield, avoiding a costly away goal for Sergio Conceicao’s side, they can now take confidence into the second leg.
Adam Lallana was back, however, after missing the past three games through injury, and could be considered for a role either against Porto or at Cardiff on Sunday.
Klopp called upon a 22-man squad at Melwood, with youngster Ki-Jana Hoever fleshing out the ranks and Rafa Camacho perhaps conspicuous in his absence following his criticism of the coaching staff on Instagram on Monday.
Joe Gomez joined Hoever in defence during the U23s’ 6-0 thrashing of Leicester at the weekend, and unlike Alex Oxlade-Chamberlain and Rhian Brewster followed this up with a place in the training squad.
He was pictured with Virgil van Dijk at Melwood, no doubt sparking anticipation for their reunion at the heart of the defence.
Spirits are high on Merseyside, with Liverpool on a seven-game winning streak, top of the league with four games to play and with a place in the last four of the Champions League in sight.
Klopp will hold his press conference in Porto at 7pm on Tuesday (BST).
Liverpool Squad in Training on Tuesday
Goalkeepers: Alisson, Mignolet, Kelleher
Defenders: Van Dijk, Matip, Gomez, Alexander-Arnold, Robertson, Moreno, Hoever
Midfielders: Fabinho, Henderson, Keita, Wijnaldum, Milner, Lallana
Forwards: Salah, Mane, Firmino, Origi, Shaqiri, Sturridge