But, after a slow start at Liverpool following his ($46 million) move, Oxlade- Chamberlain has started to hit his stride in recent weeks - just in time for his first return to Emirates on Friday. "Alex came in the middle of the season, that's why I don't like these late transfers but that's how it is", Klopp told Liverpool's website on Wednesday.
Oxlade-Chamberlain would join Liverpool four days after the game and Wenger concedes he made mistakes that day. "I think the biggest improvement, or the biggest potential he still has, is really being involved in goalscoring situations, because he has it in himself", Klopp said.
Reds boss Klopp has been impressed by Oxlade-Chamberlain's development at Anfield, saying: "He had to adapt". "It is unbelievable, but he was not asked for this too much I think in the past". Once you get comfortable with that, you can start to relax more.
"So I'm fine for the moment, it is all good, but I see really a lot of space for improvement as well, and that's good".
"For example, Alberto Moreno did fantastic this season, and then we played at Sevilla and he did not well".
"We have to analyse that well, and as well you have to guess a little bit who will play".
"Against us it happened quite often that they played a lot of long balls, with Giroud".
He said: "They are a complete side, able to do everything".
"Of course Giroud won't be playing, it could change a few things maybe". "They will have a strong side, whoever will play". They have plenty of offensive players and looking at them recently they have changed a lot their teams - so it's hard to guess.