After winning just 2 of their first 13 Premier League games and following the defeat to Wigan Athletic, chairman Ellis Short moved to sack Steve Bruce on 30 November. Assistant manager Eric Black assumed first team responsibilities until a new manager could be found.Martin O'Neill was appointed manager on 3 December with a three-year contract.

Updated 13 May 2012

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Total spending: £28,350,000

EU = if holds or not a European Union passport; Country: when 2 flags, 1st flag = country that plays for internationally, 2nd flag = country of birth; N = number on jersey; P = Position (for position name, pause mouse pointer on abbreviation); Name = Name on jersey (for more extensive name, pause mouse pointer on name); Age = age on the day of the signing; Moving from = only indicate the club the player was playing before start playing for this club in this season, for the type of the moving see Status column; Moving to = only indicates the club the player is going to play next, for the type of the moving see Status column; Ends = when the player's current contract ends; n/a = Not applicable. Total income: £25,000,000

...
Wikipedia