All the comings and goings in the world of football.

• Manchester United have signed former Barcelona goalkeeper Victor Valdes on an 18-month contract. The 32-year-old has been undergoing rehabilitation from an anterior cruciate ligament injury since leaving Barca in the summer.

• Hamilton Academical manager Alex Neil left the Scottish Premier League club to take charge of English Championship side Norwich City.

• Vitor Pereira, who won back-to-back Portuguese titles during a two-year stint with Porto, replaced Michel as coach of Greek Super League side Olympiakos.

• Eugen Trica, who won the double with CFR Cluj as a player in 2008, has taken charge of the Romanian club for a second time.

• Jesse Marsch replaced Mike Petke as coach of MLS club New York Red Bulls.

• Robin Dutt, who was sacked as coach of Werder Bremen in October, has been appointed director of sport at Stuttgart.

Dutt, who had a similar role with the German Football Association prior to joining Bremen, replaces Fredi Bobic, who was dismissed in September.

• Cameroon midfielder Alex Song, who is currently on loan at West Ham United from Barcelona, retired from international football after being left out of his country’s Africa Nations Cup squad.

Michel Olympiakos

Olympiakos have sacked their coach Michel, despite him leading them to back-toback titles.

• Olympiakos sacked coach Michel with the side second in the Greek Super League.

• Interim coach Mauricio Soria signed a four-year permanent deal to lead Bolivia’s national side.

• Level on points with Apollon at the top of the Cypriot league, defending champions APOEL parted company with coach Giorgos Donis the day after they were held 1-1 at home by bottom side Ayia Napa.

For our guide to who’s hot and who’s not in the world of football management, check out World Soccer’s Managers Index.