And Delaney believes the appointment of new coach Paulo Sousa has helped improve his performances.
The double-blow will add to manager Paulo Sousa's midfield woes with Joe Allen, Andrea Orlandi and Jordi Lopez already sidelined.
His successor Paulo Sousa, recruited from Swansea, was sacked by the Foxes on Friday after only nine league games in charge.
Under new manager Paulo Sousa, Williams has continued to form the back-bone of Swansea's defence this season and also has two goals.
The 27-year-old is enjoying a fresh lease of life under new manager Brendan Rodgers after being sidelined by former boss Paulo Sousa last season.
BBC: Striker Stephen Dobbie agrees new Swansea City contract
Idrizaj, who played for FC Eilenburg in the German Regional League last season, is manager Paulo Sousa's second signing since taking charge in the summer.
The 29-year-old Spaniard was signed on a free transfer in July 2009 by former manager Paulo Sousa but struggled with injury and was out of favour.
Under Briatore, John Gregory was sacked, Luigi De Canio left for personal reasons, Iain Dowie was sacked and Paulo Sousa had his contract terminated in April.
Pearson, speaking after his successor Paulo Sousa was sacked, with Sven-Goran Eriksson set to take over, was unhappy the club did not try hard to keep him.
And Swans manager Paulo Sousa - who he defeated to win the managerial gong - celebrated, for the time being at least, moving his side into the Championship play-offs place.
His relationship with former Swans boss Paulo Sousa was strained ever since Sousa publicly revealed in December 2009 that Britton had not signed "the best contract in the history of the club".
Manager Paulo Sousa shrugged off criticism of his repeated tinkering with the team to make six changes, Federico Bessone, Albert Serran, Kuqi, Cedric van der Gun, Leon Britton and Gower all recalled.
When Mills' header put Reading in front for a second time, Paulo Sousa's side were unable to come back - as in the dying stages Federici pushed away a headed effort from Moreno and then parried a Fryatt shot.
"These are extreme cases, and we cannot just let people die, " Eloisa de Sousa, Sao Paulo's justice secretary, told the AFP news agency.
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