Cardiff City have signed Wigan Athletic midfielder Jason Koumas on a season-long loan deal. Koumas enjoyed a successful season loan spell at Cardiff in the 2005-06 season and he has been linked with a move back to the Bluebirds since that time. Cardiff boss Dave Jones tried to sign him following his successful loan spell only for West Brom to reject their overtures. The 30-year-old has dropped out of the picture at Wigan and he has been told he does not figure in Roberto Martinez's long-term plans. Jones is keen to strengthen his squad before the start of the Championship season this weekend and he has agreed a loan deal for the Wales international. Cardiff are currently under a transfer embargo but it is expected that once this embargo is cleared, Koumas will join the Bluebirds. Koumas will help fill the void left by Joe Ledley's departure to Celtic and his arrival will come as a welcome boost ahead of this Sunday's big kick-off against Sheffield United. Bluebirds chief executive Gethin Jenkins told City's official website: "We continue to work towards removing hurdles at the club and are working with the intention to come out of embargo ahead of the new season. "During this time, Dave [Jones, manager] has presented targets including Jason Koumas as he looks to strengthen the squad. "We are pleased to have agreed terms with Wigan and to welcome Jason back to Cardiff City."