Any starting side and player additions are going to mean that some players miss out; you simply cannot fit 20 players on the field at the same time together, as much as you might like to.
This starting side is no exception to that, so let's take a look at some of the notable omissions from this Liverpool starting team to include Coutinho.
GK: The only other alternative to Reina is Brad Jones who, despite being strong this season, hasn't done enough to justify a permanent switch at the back from the Reds.
DEF: Jose Enrique has been hot and cold this season, but with the long-term signing of Wisdom, looks to have lost his starting spot out on the left-hand side of the field. Martin Kelly is also victim of this, though both are likely to make the substitutes bench.
MID: The presence of another midfielder means someone has to miss out, and the big losers here are Jordan Henderson and Lucas Leiva. Both have been superb this year and will likely rotate with the likes of Coutinho and Allen for starting positions and opportunities. Suso and Jonjo Shelvey still aren't quite constant first-team candidates at the moment.
ATT: Say what you want about Stewart Downing, but the man still continues to make the England national team—meaning that he must be doing something right. Sturridge's arrival and early success has likely forced him on the outer, with Fabio Borini another big loser from the success of both Sturridge and Sterling at Liverpool this year. Neither player deserves a starting berth more than the players mentioned.
How do you think Philippe Coutinho would work Liverpool's starting side?
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All statistics courtesy of WhoScored.com