Keane signed for Liverpool in July
Robbie Keane has become the latest in a long line of Liverpool footballers to be targeted by thieves.
The 28-year-old's penthouse suite was raided while he was away for Ireland's 2-1 win over Georgia on Saturday.
Keane had been using a Liverpool hotel while he searched for a home after his £20m move from Tottenham.
It is believed an expensive watch and jewellery were stolen. Steven Gerrard and Pepe Reina are among the club's stars to have been burgled in the past.
A spokesman said: "Merseyside Police is investigating reports of a theft which took place in a city centre hotel.
"A quantity of jewellery was taken."
Former Liverpool players Jerzy Dudek and Peter Crouch were also burgled during their time at the club.