Arsene Wenger was handed an immediate return on his £43million investment in Mesut Ozil after he left his sickbed to inspire Arsenal to victory at Sunderland.
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The Germany international turned in an outstanding first-half display at the Stadium of Light as the Gunners claimed a 3-1 win, although in controversial circumstances which saw Black Cats boss Paolo Di Canio sent to the stands as time ran down.
Wenger said: "He [Ozil] was like the team - he had an outstanding first half and dropped physically in the second half.
"He was sick on Thursday night and I decided only today to play him, this morning. He had a stomach bug and didn't feel well.
"He dropped a bit physically in the second half, but his first half was outstanding."
Ozil needed just 11 minutes to make his mark, effortlessly pulling Kieran Gibbs' long ball out of the air and crossing for Olivier Giroud to sweep home the opening goal.
Theo Walcott wasted two glorious opportunities, both of them set up by Ozil, to beat keeper Keiren Westwood and then headed wide from Giroud's cross with Sunderland, who had earlier hit the bar through Modibo Diakite, in disarray.
However, half-time substitute Craig Gardner dragged the home side back into it with a 49th-minute penalty after Adam Johnson had been tripped by Laurent Koscielny, and the visitors found themselves on the back foot for the first time.
Aaron Ramsey volleyed Wenger's men into the lead with 67 minutes gone and then sealed the win nine minutes later, but not before referee Martin Atkinson had intervened.
Jozy Altidore and Bacary Sagna became embroiled in a wrestling match which the United States international eventually won before stabbing the ball past keeper Wojciech Szczesny.
However, Mr Atkinson had already blown for a foul by the defender, who was then only booked as the home crowd howled for a red card.
Di Canio, who was sent to the stands after complaining to the official about Giroud's dawdle from the pitch when he was substituted in injury time, said: "It was a mistake.
"The referee has the power to wait to see how the action finishes, and then he can come back to his decision.
"They have to wait. It's not Paolo Di Canio, it's the rule, so he made a mistake because he stopped the game early, especially in the balance of the action.
"You could see Altidore is much more powerful than Sagna, he was shielding the ball well. It was clear he was near to winning the challenge.
"That was a key moment because we can't imagine that we would have many more opportunities to score, so that decided the outcome of the game.
"That can happen. He is a man. It's important that he accepts this - I make mistakes every single moment when I make decisions with my players; my players make mistakes in front of goal."
Wenger admitted his side had been fortunate, although he was not convinced Sagna's challenge warranted a sending-off.
He said: "Look, it's one of these things that are controversial because the referee had blown the whistle before the ball [had gone in] for the foul.
"If it's no goal, people moan because he didn't give the foul, and he could have given a foul on Sagna as well because both were holding each other off.
"But was he last man? No. It's difficult to decide that. I don't think he was last man because Koscielny was covering.
"But we were a bit lucky, yes, because this kind of situation can go in your favour and can go in the favour of Sunderland."