Human remains have been found and a man is in custody as police investigate a suspicious disappearance.

Joshua Bishop was last seen by his housemate in Sunbury, Melbourne, on May 27, and his mother reported him missing two days later.

Victoria Police mounted an extensive search for the 23-year-old and made a public appeal for help, with Bishop’s family saying his disappearance was completely out of character.

Police said they found human remains on Saturday while searching a home in Westmeadows.

They are yet to be formally identified.

Detectives also arrested a 27-year-old man, who they were to interview about the remains.

The investigation continues and police urge anyone with information to come forward.

—AAP