If Liverpool were to put together a major title challenge this season, they always needed the depth of their teams.
And so it has already proven itself.
Jurgen Klopp mixed his pack for the trip to Burnley, and although Liverpool had slipped to 1-0 in the night, Liverpool came back to win and keep the title challenge on track.
The Reds boss did his part to win by not only selecting the right team, but also changing the gameplay with his substitutes.
Then came Roberto Firmino and Mohamed Salah to change the outcome of the game. The Brazilian put Liverpool in front after James Milner's equalizer before Salah Xherdan hit Shaqiri to score the third goal of the match.
Of course, they are not the only substitutes that have a big impact this week. Divock Origi appeared from the bench and became the unlikely derby hero with one last breath against Everton.
It has been an issue throughout the season so far. Daniel Sturridge played from the bench and met West Ham and Chelsea. Shaqiri scored a late goal against Cardiff. Firmino won in the Champions League a victory against Paris-Saint Germain.
In the Premier League and in the Champions League, the goals of substitutes reached a total of seven extra points. This underlines the influence of Klopp this season.
In fact, six submarine goals have been made by Liverpool more than last season.
This is another clear sign of the progress that Liverpool has made under Klopp this season. His summer signings have not only significantly improved the defense, but have also made the Reds compete on all fronts.