Motherwell have signed York City defender Anthony Straker on loan until the end of the season.
Inter Milan boss Roberto Mancini has hinted that he could bid for Manchester City midfielder Yaya Toure in the summer.
The 23-year-old Iceland international winger has been with AZ since 2009, but he has decided not to sign a new deal at the AFAS Stadion.
Dutch clubs have to announce by April 1 whether they will renew deals of out-of-contract players, and AZ have confirmed that they will not be signing a new deal with Gudmundsson.
It is widely expected that Gudmundsson, who spent time with Fulham as a teenager, will be heading to England on a free transfer.
Previously, the likes of Bolton, Wigan and Nottingham Forest have been linked to the highly-rated wide-man.
Meanwhile, AZ have confirmed that Erik Falkenburg, Raymond Gyasi, Erik Heijblok and Paul Kok will also be leaving in the summer.