The 32-year-old has scored 68 goals in 278 appearances for the Toffees after completing a £1.5 move from Millwall to Everton in 2004.
News of the Australia international’s probable departure prompted a flurry of Tweets online – and here are some that caught our eye.
Queens Park Rangers midfielder Joey Barton (@Joey7Barton) heaps praise on the Everton legend: “As a boyhood Evertonian, can I just wish @tim_cahill all the best in the MLS @ New York. A bargain for £1m. Top player and great competitor.”
Everton’s Jose Baxter (@jbaxter_37) will miss Cahill: “Tim Cahill is a legend no matter what people say about trophies and etc. the man was a top player and a proper gentleman. Wish him luck.”
Hayden Jillions (@Hayden_Jillions) hails Cahill’s achievement in his spell at Everton: “Eight years ago today, @Tim_Cahill signed for @Everton. In that time he has 278 Appearances and 68 goals for the Blues. #Legend #EFC”
Erin McGuire (@ErinMcGuire_10) reckons Cahill is still good enough for the Premier League: “Good luck to Tim Cahill in the MLS.. Another good player gone there that shouldn’t be there yet & should still be in the Premier League in my opinion.”
While Royston Martis (@roamingroyston) believes Cahill is the best value buy in the Premier League era: “Will miss @Tim_Cahill in the Premier League. Surely football’s best bargain buy of the last decade. Good luck in New York Tim.”
Rob White (@robbo123) says Cahill has been a top-class player for the Toffees: “@Tim_Cahill If the rumours are true about #nyredbull Then It has been a pleasure having you in the premier league – brilliant player #class”
But Karl Gibbs (@KarlosGibbs) thinks Everton should have received a bigger transfer fee: “Can’t believe Everton have sold @Tim_Cahill to New York red bulks and for so little!! #TopPlayer”
Liverpool fan Ben Pitcairn (@BenPitcairn) won’t miss Cahill: “Can’t say I’m not glad to see the back of @Tim_Cahill, always seemed to be the difference against us! #allthebest”
And Rach (@liverbabygirl) thinks the prospect of Cahill playing alongside Thierry Henry is a tantalising one: “Just remembered Tim Cahill will be playing with Thierry Henry in New York….Not bad viewing if I say so myself!”
Aley Benno (@1999aley) describes Cahill as a true Everton legend: “@Tim_Cahill Timmy you’re one of the best players to ever grace Goodison, a legend and will always be remembered as the soul of Everton #legend!”
And finally, Patrick Easton (@PatEaston) says Cahill is one of his all-time favourites: “Gutted I’ll not be watching @Tim_Cahill on MOTD next season, one of my favourite premiership players of all time!”
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