"There are some good teams left in it but we're confident in ourselves", said Wilshere.
"We can still have our say in the second leg and I don't know why people think we're going to London just for a vacation". Considering that, as well as Arsenal's form at home this season, it will be tough for Watford to break their defence and score goals.
With Arsenal holding a 2-0 lead against AC Milan and playing the second leg of their last-16 leg tie at home on Thursday, Wenger took a risk by making six changes.
"We started the game thinking we're in for a real test here and we have to be ready defensively, we have to be willing to work hard, to dig in, dig deep", he said.
The scoreline was a very fair reflection of the game, with Arsenal dominating every aspect of the 90 minutes, showing some much-needed quality and passion. It has to carry on.
"We have to use this win, use it as sort of target".
Midfield: Aaron Ramsey was excellent against Milan and took his goal superbly well so we should see the Welsh worldwide keep his place in midfield on Sunday.
Trump accepts invitation to meet North Korea's Kim Jong
July 28: A second Hwasong-14 is launched with an estimated range reaching into the USA mainland, including cities such as Chicago. At the time, Defense Secretary Jim Mattis said that the exercises would go ahead once the Paralympics concluded.
Calum Chambers and Sead Kolasinac both went off injured against AC Milan and will be assessed late before the game but remain doubtful.
The Watford skipper hit out at Arsenal in October when the Gunners were beaten 2-1 at Vicarage Road, insisting Wenger and his team should show some "cojones" rather than blame the referee.
Having refound their confidence, Arsenal played some flowing football as they repeatedly caught Milan on the break, leaving the Serie A side's coach Gennaro Gattuso red-faced with anger on the touchline.
"You think I haven't had enough controversy in the last few weeks?" I continue to maintain Serie A is the more hard league, but the Premier League is physically tough. "You want to make 30 million people happy and that is what I care about".
"If I respond to every single statement in the country I would be mad".
Speaking to BT Sport after the game, Deeney said: "I've heard Wenger's already blaming (the decision) as the reason why they lost".
Arsenal have taken a different approach in tabling a deal for the 26-year-old, the Standard say, with the offer involving performance-based structure due to Wilshere's injury history.