Five things learned about Liverpool in their extraordinary comeback against Borussia Dortmund

Liverpool somehow booked their place in the Europa League semi-final with a 4-3 win over Borussia Dortmund at Anfield.

It really is hard to put into words what 42,984 spectators witnessed at Anfield last night. Borussia Dortmund were so good in the early stages of the game, and comfortably the best side that have rocked up on Merseyside this season as they went two goals up inside eight minutes.

The constantly threatening Divock Origi got a goal he deserved and then Marco Reus seemed to have wrapped the tie up by restoring Dortmund's two-goal cushion.

Then that final 25 minutes. Philippe Coutinho kept the tie alive, Mamadou Sakho inflated the belief, and Dejan Lovren - much maligned in his first season at the club - had his finest moment in a Liverpool shirt that will probably never be topped as he scored just his second goal for the Reds. It still feels a bit surreal when sitting down to write this now, truth be told.

James Milner in central midfield? No. James Milner operating in a wider/advanced role, yes

He never really looked comfortable in a central role as the early Dortmund whirlwind exposed his limitations but when he was moved further forward his contribution was exceptional, apart from his corners but Jurgen Klopp dealt with that aspect brilliantly in his post-match press conference when it came to fans moaning. A lovely little ball for Philippe Coutinho's 11th goal for the season, and the thinking in the build-up, followed by the cross for Dejan Lovren's winner, means his contribution was ultimately stunning.

Anfield is still capable of the great European nights, and Jurgen Klopp is into Liverpool folklore regardless of what follows

That one will not leave the memory bank. The story behind it - with Klopp facing the club where he truly made his name - makes it that bit more memorable. Former boss Rafa Benitez built his reputation with the Reds down to a large part with what his side's would deliver under the lights in Europe at Anfield. Six months after taking over, Klopp has one that matches those deliver by the Spaniard. Kopites will happily take a few more of them under the German.

Divock Origi's stock continues to rise

It really is difficult to say just how much the young Belgian forward has transformed during his time at Liverpool. Once again, he gave the Dortmund defence a torrid time. Even in the first half, you felt he was doing all the right things but just wasn't getting his reward. A cool head in front of goal followed in the second half to get everyone believing again, his very presence, especially when later joined by Daniel Sturridge, caused havoc. Back in October when he was struggling for form, Klopp said Origi was a player that Liverpool were going to have fun with and it's difficult to argue. 

Another shining example of Liverpool's belief and character

A lot has been said about Klopp instilling fight and belief in his side. They have started to score late goals, playing to the final whistle, and coming from behind to win games. This was an example of all those aspects. Liverpool now have fight and character by the bucketload.  

As it stands, letting Joe Allen go would be madness

It's remarkable the transformation that Joe Allen has made, truth be told he has never been a bad player but his impact from the bench last night was telling. He battles, he passed the ball well and despite his small stature he wasn't afraid to get stuck in against those who are a foot taller than him. Liverpool have linked with several central midfield players, which could see a change in dynamic to this current Reds team next season. Allen has a year left on his deal in the summer and he just seems to be the kind of option Liverpool need right now, but all of that can change in the summer depending on who comes through the door. 

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