Peter Enckelman, whose mistake handed Portsmouth their winning goal in the FA Cup final, has been released by Blackburn.
The Finn, 31, was in goal for Cardiff at Wembley on Saturday and parried a cross straight to Kanu, who netted from close range in Pompey's 1-0 victory.
And Rovers have confirmed Enckelman, on loan at Ninian Park since January, is one of three players who will leave Ewood Park this summer.
He made only three appearances in four years as Brad Friedel's understudy.
However, Enckelman has been offered a permanent deal by Cardiff boss Dave Jones.
Also on their way out of Blackburn are Swiss defenders Stephane Henchoz and Bruno Berner.