Blades stalwart, and longest serving player, Nick Montgomery is to continue his career in Australia after mutually agreeing a termination of his Bramall Lane contract.
The popular midfielder, 30, came through the youth ranks at the Lane and went on to make a more than 400 senior appearances for the Blades.
He has played for the United first team for over 12 years, mainly in the Championship, plus a season each in the Premiership and League One, whilst the last couple of years have been interrupted with the birth and complications of his twin girls, who were born prematurely.
However, following discussions, he is now set for a unique opportunity of playing in Australia and will join up with the A-League's Central Coast Mariners in the next couple of weeks.
Nick, who has also captained the Blades, told sufc.co.uk: "This is always something I've always wanted to do and after long talks with the family we have decided that this is the right time to take the opportunity.
"There were numerous options available, I've turned down other offers and there was an enquiry from the MLS in America but both (wife) Josie and I have friends in Australia and this is a chance of a lifetime, amazing opportunity to experience something new.
"I've loved my time at Sheffield United and will leave with great memories, I have turned down so many opportunities to move in the past but I have always stayed loyal to the club as they have to me. You don't stay in one place for as long as I did if you don't have affection for the club, but I appreciate the situation at Bramall Lane and feel it is the right time to move on. I will miss everyone as I have made so many friends over the years.
Blades chief, Danny Wilson, added: "He has opted for a different direction and good luck to him. Over the years he has been a tremendous attribute to Sheffield United, giving his all, week in, week out.
"On behalf of everyone at Sheffield United, and that includes the supporters, I would like to wish him well in his next venture."