Borussia Dortmund coach Jurgen Klopp feels the addition of Mesut Ozil has transformed Champions League opponents Arsenal.
Klopp is in no doubt it was money well spent as he prepares to tackle the Gunners in Tuesday night's Group F showdown at the Emirates Stadium.
"This team missed one player and maybe it can be Mesut Ozil," said Klopp, who will serve a touchline ban on Tuesday.
"He is technically perfect, he is fast and has developed a drive to goal.
"He is very intelligent, can play in any team. He has everything, is natural and it works very well.
"That is why it was a great idea from Arsenal and not so from the one (team) who let him go."
Klopp added: "One year ago no-one thought it was possible they could play brilliant football without (Santi) Cazorla, now they have some injuries and still look strong with Ramsey and Wilshere, Rosicky is back in shape and Giroud, he is one of the best (strikers).
"As a supporter this is one of the most beautiful types of football to watch, I like it.
"Who is strong enough to be champions in the Premier League is of course strong enough to go to the final of the Champions League.
"Now they are back in the race (for titles) and we want to stop them."
