Neither Karius or Mignolet are good enough for this club, the fact they've been swapping with each other even since the German arrived last summer proves that neither can hold down the number one shirt.
Karius was given a go, once he returned from injury, last season and after a run of some embarrassing mistakes he lost his place and didn't start another Premier League game from the 11th December onwards. Mignolet actually did alright when he came back into the side and it was pointed out by Jamie Carragher on numerous occassions that the performances from the Belgian may blind the club into thinking we didn't need a new keeper in the summer. Mignolet then started as number one for the League and Karius for Europe going into this season where both have made errors on a regular basis. Not every error leads to a goal, even for keepers. Errors include flapping at crosses, making the wrong decision with the ball at their feet, rushing out and getting nowhere near it etc etc.
And now we're back at square one where one keeper has made too many mistakes and forced the manager's hand into making another change. So Karius is back in favour and in his first League outing in over a month, he makes another mistake. Now if he makes more mistakes in the upcoming games against Swansea and Huddersfield (and West Brom, if he's still our Cup keeper) does Klopp have to change it again for the month of February?
For me, we need to address the situation now before it's too late. The window is open, bring in a world class keeper now - whoever that may be (I'm not gonna name names because I don't know half the people who are being banded around on these boards). Even if that keeper is inelgible for the Champions League, get them in now because they will be available for the League and given the likelihood of mistakes from our keepers, top four is not a guarantee just yet meaning come the summer we might not have Champions League football to offer these keepers, so get a keeper in who you know will do the job to ensure we are in the top four and back in the Champions League next year.
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