The force refused to comment on speculation the gang may have fled abroad.
Grealish’s partner Sasha Attwood and members of his family had gathered at the lavish property for Christmas celebrations at the time.
They heard a disturbance and raised the alarm while Grealish was still playing at Goodison Park stadium in Liverpool.
Jewellery and watches worth £1m were stolen, according to The Sun newspaper., external
A police search was carried out, supported by dogs and a helicopter, but officers failed to find any suspects.
Grealish, 29, and his partner had only moved into the house just days earlier.
The £100m player said he was “devastated” by the “traumatic experience”.
“My family mean the world to me and nothing is more important than ensuring their safety,” he wrote on Instagram., external
