Leeds have endured a tumultuous time of late, with managers arriving and departing with regularity, and the club's supporters will hope that Radrizanni's tenure as owner will signal the start of a comparatively stable period.
Paul Clement has instigated in the recent past that the former Arsenal youth player will have a role at the Liberty Stadium next season, but with his contract running down the Welsh club could be forced into a decision. That came a day after APOEL lost the Cypriot Cup final to Apollon Limassol.
"We are delighted to make this announcement today as it successfully concludes what has been a thorough and extensive search, following a huge level of interest from all over the football world", said Leeds United Managing Director Angus Kinnear.
The Whites had been linked with Victor Sanchez, Alan Pardew, Quique Flores and most recently Fernando Hierro, but in the end the club has fooled us all by going left field with Christiansen, who didn't even feature in the betting until the very last second at 1/10!
The Danish-born forward was eligible to play for Spain and earned two senior worldwide caps for La Roja, scoring once.