Arsenal manager Arsene Wenger believes Danny Welbeck will be a real worry for opponents once he regains full match fitness.

The 25-year-old striker started ahead of Olivier Giroud in Saturday's North London derby at Tottenham Hotspur which ended in a dramatic 2-2 draw.

Some have criticised the former Manchester United man for being suspect among the rigours of the Premier League but Wenger is confident that he will be a constant threat after getting through 85 minutes of the night octane local derby.

"He has worked very hard," Wenger said.

"I have seen every day the effort he has put in. Someone is telling me always 'in the Premier League he cannot play the whole game' but I have seen what he has done in training and I got a lot of encouragement from that.

"Even when I took him off you could still see that if needed he had a little burst to go. But from then on I thought maybe we do not want a setback for him.

"Medically they have questioned his knee is not true completely and so they are still a bit worried, but he looks perfect.

"I felt as well that he could give them problems with pace. I like him in there because he is a combination of pace and stature.

"He has a good mixture. So when Danny Welbeck is determined and really goes for it and he is ready for the fight, he has all the attributes to play up there."