Kean came under intense scrutiny from sections of the supporters this season after a disappointing run of form, with a number of Blackburn's fans staging protests for the removal of the Scot.
However, Rovers have recently enjoyed an upturn in form that has lifted them out of the relegation zone, and Ferguson, whose side travel to Ewood Park on Monday, has come to the defence of his compatriot.
"I am sure a lot of them are saying to themselves 'I wish I hadn't done that'," Ferguson said of the Blackburn fans. "Things can change. You have to dig in and not let it get to you.
"Now no-one is talking about fans having protest marches. He has held his dignity very well and deserves 100% praise from everyone, including his own supporters. He has shown his mettle in times when it was difficult for him."