M. Salah corrected his mistake by scoring 2 goals in this match. I think Salah is in full confidence in this match. But Newcastle in the first half also seemed to make things a little difficult for the home team. But still Liverpool playing at home always brings high confidence to the Liverpool players thanks to the support of the audience in the stadium.
Salah scored many goals for Liverpool and he helped them to get many points, saved them many times. In this match, he opened it for Liverpool too but I think Salah does not have good skills for penalty shots. His style is like just make a shot as most powerful and accurate as he can, the rest will belong to opponent goalkeeper. He does not have good skills to trick opponent goalkeepers at the penalty spot.
Salah has indeed been a hero for Liverpool in almost all matches. Well his skills in penalty shots are not that good. But apart from that, he is currently the top scorer in the Premier League along with Haaland. With a total of 14 goals currently the same as the number of goals scored by Haaland. In fact, Salah almost became the 1st top scorer if he managed to take advantage of the penalty in the first half. I don't know if this is just my opinion or not, but I think Salah's performance this season is much better than his performance last season.
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FA Cup is not important with Liverpool because they still have Premier League and Europa League to fight. I am sure that Klopp learned a lot from two seasons ago, when Liverpool aimed at many titles, managed to have chances winning them all but at the end, they failed. One season after that, their players began very poorly and many players got injuries, which cost them a position beyond top four in the last season.
I believe Klopp will not repeat that mistakes with overwhelming ambitious targets in this season and they might sacrifice FA Cup to focus on Premier League and Europa League.
Maybe this is true as you say. That's why Liverpool can make the match in the FA Cup just a test to see how strong they are. But it would be much better if Liverpool only had to focus on the European League and Premier League at this time. Because trying to win many titles does have quite a high risk in the fitness of the players themselves.