The Dane is now expected to feature n the midweek Capital One clash against West Bromwich Albion.
"He is a good striker. He could play against West Brom, he will be in the squad for sure," said Wenger.
"It is a fantastic opportunity for him. Honestly, he was supposed to go, but he stayed and once he stays you have to consider him as a full player of the squad.
"If he deserves to play in front of [Olivier] Giroud, he plays in front of Giroud. That is as simple as that.
"He lost his way a little bit, but he is not a bad boy. He is a good guy.
"He took the easy way a little bit but now he realises there are some [signals] in your career when players think that is the moment for them. He has got the message."