It seems only a matter of time before huge chances take place at Arsenal Football Club.After failing to qualify for the Champions League for the first time in 20 years last season, the Gunners currently sit sixth in the Premier League and are 12 points behind league leaders Manchester City.The days of Arsenal making a genuine challenge for the title seem to be fading and with Mesut Ozil, Jack Wilshere and Alexis Sanchez out of contract at the end of the season, Arsenal could look very different this time next year.The chances of Sanchez or Ozil changing their mind and signing a new deal are slim to none, so boss Arsene Wenger will have already begun the scouting process to fill their massive voids next season.Sanchez has been Arsenal's focal point since he arrived at the club from Barcelona back in 2014 and many Arsenal fans are frustrated that the Gunners let such an important player wind his contract down.Wenger has previously stated that the club would have to spend upwards of £60 million to replace someone the calibre of Sanchez, but now it appears he has a new idea.The Sun are reporting that Arsenal are targeting a £35 million deal to secure Wilfried Zaha from Crystal Palace as the Chilean's replacement.The Eagles have been having a rotten season thus far, but the Ivory Coast international has been their one bright spark playing a central role in the four points they have gained this season.Wenger admitted back in 2013 he was looking at the flying winger prior to his move to Manchester United.On Zaha, he said: "We are looking at him, but at the moment we have not made any bid for him."I don't know if Manchester United are in for him. Anyway, if you call any club for any player, they will tell you Man Utd, Milan, Real Madrid are as well in for him, but it is always difficult to know if it is true or not."Zaha's big move to Man United proved to be short-lived, but the 25-year-old has undoubtedly matured since returning to Selhurst Park.Still, could he really fill Sanchez's boots? Arsenal fans are having a hard time believing so: