The early stages showcased the "average" Liverpool that Klopp referred to after they ground out victory over Huddersfield at the weekend, with passes misplaced and Red Star looking the more threatening.
The forward suffered a broken thumb during a training session with Senegal last week and subsequently missed Liverpool's 1-0 win over Huddersfield on Saturday evening but has now made a return to training.
Reid scored 21 goals for Bristol City last season to earn a £10million move in to the Premier League at Cardiff.
Liverpool doubled the lead right before half-time when Salah scored his first on the night with a strike to the near post, set up once again by Shaqiri on a quick tap from just outside of the box.
Good evening! Welcome to the Live Updates of Liverpool Vs Red Star Belgrade in the Champions League.
"If we can maybe get a point there, or a good performance, then we can take it in to the games after that and have a good go".
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This is one process: to work every day and not the possibility to say now we have a winning mentality. It [playing on Monday] has the advantage for more time to prepare the match - that's one positive.
The Senegalese forward gave Red Star captain Filip Stojkovic a torrid night with his direct running and trickery on the left wing during the European clash.
This though is not the first time that Man United have been late for a game as the same thing happened during their Champions League game against Valencia.
The 4-0 win over Red Star Belgrade however will both have taken much out of Klopp's side, who rested some players.
"This is a fella that scored 20 goals in the last two seasons for Monaco as a midfield player".
"It's great - I'm happy to score my 50th goal for Liverpool". Any undistributed money (i.e. €120,000 per draw) was redistributed among all of the clubs participating in the group stage, in proportion to the number of wins achieved by each team.
Cardiff manager Neil Warnock has managed four away games against Liverpool in his managerial career, losing all four without seeing his sides score a goal - he has lost to a different manager on each occasion (Souness, Houllier, Benitez and Dalglish). Alisson has recorded six clean sheets in his opening nine Premier League starts so far.