Alexis Sanchez
Sanchez was lucky to escape without serious injury after being fouled by Melo.Getty Images/ADRIAN DENNIS

Arsenal manager Arsene Wenger is optimistic both Alexis Sanchez and Jack Wilshere came through the Champions League thrashing of Galatasaray unscathed despite the pair playing a limited role at The Emirates Stadium.

Sanchez, who netted the third goal of his Gunners career in the 4-1 win in the first half, was replaced by David Ospina after the hour mark following the sending off of Wojciech Szczesny, but was the victim of a horrid two-footed lunge by Felipe Melo.

Wilshere meanwhile made a 13-minute cameo after going off in the draw with Tottenham Hotspur with an ankle injury, leading to suggestions he may not be fit to start the trip to Chelsea this weekend, but Wenger has confirmed the duo are fit to face the Premier League leaders.

"[Sanchez] looks alright," said Wenger. "It could have been a red [the tackle by Melo]. I'll have to see it again. It looked from where I was that it was a red.

"I took Alexis off to be a bit more solid defensively once we were down to 10 men. Unfortunately, in my life I haven't met many players who are happy to come off."

Wenger then confirmed that Wilshere will be fit to play 90 minutes against Chelsea on Sunday, a critical boost for Arsenal with both Aaron Ramsey and Mikel Arteta out for at least a month with respective hamstring and calf injuries, while Abou Diaby is also unavailable.

After a run of one win in their last six games, the win over Galatasaray was a welcome return to form for Arsenal who travel to unbeaten Chelsea this weekend in a genuine test of their improvement.

Danny Welbeck's first professional hat-trick illuminated the hosts' performance and England assistant coach Gary Neville believes Chelsea defenders Gary Cahill and John Terry will fear the prospect of facing the red-hot forward.

"Outside the box he is unplayable at times, he's a nightmare," he said. "He plays against John Terry and Gary Cahill on Sunday and they will not want to play against him. He's quick, he's strong and just the last bit has got to be delivered more consistently.

"If he can get goals more consistently to his game you've got a real top-class centre-forward there."