Manager Simon Grayson declared O’Brien had no future at Elland Road after the centre-half refused to play in Leeds’ 2-1 win at Burnley in November and the 32-year-old has been sidelined since.
But following an internal inquiry the club have urged fans to give the former Republic of Ireland international their full support after his treatment at the Sporting Chance clinic.
A club statement read: “The club brought disciplinary action against the player following his refusal to play against Burnley on the November 19, 2011. It was announced at that time that the player’s future would be determined after a full investigation. The investigation has led to a fuller understanding of the issues that the player has faced since the start of the season, which has seen him seek specialist medical treatment at the Sporting Chance Clinic for depression. He is now ready to recommence training and the club will facilitate any further treatment that is required.
“On this basis we believe he deserves a second chance and we will do everything we can to assist him.’’
Elsewhere yesterday, Irish international midfielder Keith Andrews got the move he was looking for as he moved to West Brom.
Dubliner Andrews had asked for a move away from Blackburn and finally got his wish as Roy Hodgson moved for him.
Striker Andy Keogh joined Millwall on a two-and-a-half-year contract from Wolves for an undisclosed fee.
The 25-year-old played a key role in Wolves gaining promotion to the Premier League three years ago but has since found it difficult to command a regular first team spot and has had loan spells at Cardiff, Bristol City and Leeds.
Stephen Dawson was another Irishman on the move yesterday and promised to bring ‘non-stop’ energy to Barnsley after completing his move from Leyton Orient.
His move to the Championship outfit comes after the League One side reluctantly accepted an improved undisclosed offer for their skipper, who was out of contract in the summer.
Meanwhile, Billy Clarke joined high-flying League Two side Crawley from Blackpool for an undisclosed fee while fellow Corkonian Roy O’Donovan joined SPL side Hibernian on loan from Coventry until the end of the season.
As expected, Graham Cummins’ move to Preston from Cork City was also confirmed.
Also on the move were Meath man Donal McDermott, who joined Bournemouth from League One rivals Huddersfield Town, and Martin Rowlands, who left QPR by mutual consent with immediate effect yesterday.