Salford say they are "extremely disappointed" after star man Niall Evalds announced he would join Castleford from next year.

The full-back, who has been at Salford since 2013, will join the Tigers on a one-year deal in 2021.

In a statement on Tuesday, the Red Devils said they twice believed they had successfully concluded talks on an extension with the 26-year-old - whose agent is former Salford head coach Iestyn Harris - only to discover he had agreed terms elsewhere.

"Salford Red Devils are extremely disappointed with the decision made by Niall Evalds and his representative, for the full-back to end his time at the club following the conclusion of the 2020 season," the statement read.

"Following a period of negotiations during February and March, Evalds was 48 hours away from signing a new deal to stay at Salford for a further three years, which had been agreed by all parties.

"A late request was then made for Evalds and his representative to have additional time to consider his options, which the club honoured.

"In April, further discussion took place and an offer was made. Both offers significantly increased the value on his current contract at the club, in addition to incorporating a testimonial and other benefits, which recognised his prior contributions.

"Salford Red Devils were led to believe that the deal would be successfully concluded on this basis.

"It was therefore extremely disappointing, after months of negotiations, when it was revealed that the player had then signed for a competitor on Saturday morning.

"It is undoubted that Evalds’ progression under head coach Ian Watson and incorporation within a system which allows him to thrive, has assisted him, along with other players, in gaining recognition across the game. Salford Red Devils thank Evalds for his service and wish him all the best in the remainder of his career."

Evalds has scored 101 tries in 146 appearances for Salford.

He joins Catalans Dragons-bound Gil Dudson in departing the AJ Bell Stadium at the end of the season. 

The statement added: "The club’s recruitment plans for the 2021 season and beyond will continue, as director of rugby and operations Ian Blease works alongside Watson to identify players with the desire, commitment and passion to form part of Salford Red Devils’ sustained progression.

"The club would like to take this opportunity to thank sponsors, season ticket holders, squad builders and all those taking up subscriptions for RDTV and virtual match days, without whom this planning would be impossible.

"The club recognises the shared difficulties for our community, during this challenging time and are therefore increasingly appreciative of your unyielding support."