Jürgen Klopp admits he now has to find the right balance in Liverpool's attack after Philippe Coutinho marked his return on Tuesday night with what the manager termed a 'really cool' moment.

The Brazilian had been out of action for five weeks until being named from the start for the FA Cup fourth-round replay against West Ham United earlier this week.

With the Reds trailing 1-0 at the interval, Coutinho levelled the tie three minutes into the second half by intelligently rolling a low free-kick from the edge of the area underneath the wall and into the bottom corner.

His contribution proved meaningless on the evening as the Hammers struck a winner late in extra-time, though it served as an immediate reminder of what the No.10 offers to Klopp’s team.

The boss said: “It was one of the smartest free-kicks in football history. You don’t see it too often, it was really cool. Phil Coutinho in good shape… I don’t know the names of too many teams in the world where he would not play.

“He had two not too long but long-term injuries – four or five weeks in the middle of the season is not too easy. So he has to come back into his rhythm, that’s how it works and we try to help him on this way.

“Of course, he’s always somebody who can make the difference in a game. But not alone, and it’s not only about quality, it’s about physical possibilities in the right moment.

“It’s not possible that he’s at 100 per cent, but he’s in a really good way and for us that’s good news.”

Coutinho’s set-piece magic changed the flow of the game at the Boleyn Ground and allowed Liverpool to seize more control from Slaven Bilic’s side.

Klopp looked to build further on that by introducing Divock Origi and Daniel Sturridge – also coming back from injury lay-offs – to a forward line which already included Christian Benteke and Jordon Ibe.

And as he previewed Sunday’s trip to Aston Villa in the Barclays Premier League, the manager was asked how he will try to accommodate the options available to him in the weeks ahead.

“It was a risky formation after our changes, when we had Jordon Ibe, Christian, Daniel and Divock on the pitch, and defended in midfield with Pedro [Chirivella] and a limping Kevin Stewart,” he replied.

“But we wanted to win the game and in the moment we saw the chance to do it. But I don’t think it’s a likely line-up for a Premier League game.

“You need balance and rhythm in your game and you cannot force it with the line-up by bringing all of your strikers and hoping that one of them will score a goal. That’s not how it works. For this game, it was OK.

“Of course, Daniel and Christian can play together. As we saw in Southampton, Daniel and Divock can play together. But it’s always about what you need for a special opponent.”

With five goals in his last six appearances for the Reds, the versatile Roberto Firmino is firmly in the reckoning too, of course.

Klopp said: “He’s a good player, there’s no doubt about this. A few weeks ago we had no strikers and now we have four strikers.

“We have really important games and it’s not about satisfying a single player, that’s not how it works. We have to find a stable formation; we always create chances, we didn’t score often enough and conceded a few too many goals, but that’s how it is.

“A lot of players are in good shape, most of the time, and then we have to try to use this. Finding a formation is always the challenge for a manager. It’s good.

“Roberto is much more stable and has much more consistency in his performances than when I came here. He is showing what he’s capable of and that’s good for all of us.”