Celtic claim a fee was agreed with Manchester City for John Guidetti prior to them taking the striker on loan.
Xabi Alonso claims no Premier League offers were put to him before leaving Real Madrid for Bayern Munich.
Kevin McNaughton is staying at Cardiff after agreeing a new deal.
The long-serving defender was out of contract at City but has now signed on until next summer.
And that means Scot's eighth season for the club will be his first in the Premier League.
He said: "I'm delighted to have committed my future to the Club and I'm buzzing for the challenge ahead.
"There was a decision to be made this summer as I want to play first-team football. I know that I've a lot of hard work to do to make sure I can achieve that here, but I'm ready for it.
"I didn't want to look back at the end of my career and think that I never gave the Premier League a crack with Cardiff City."
Cardiff boss Malky Mackay said: "Kevin has been a terrific servant for this football club and I'm thrilled he's staying with us as we prepare to embark on the Premier League.
"Good, experienced professionals like Kevin are essential for a squad's success and I know this news will please City supporters, as much as it does my staff and I, who know and appreciate what a hard working a dedicated Cardiff City player Kevin is."