Julian Wooster, Portsmouth City Council's director for children's services, said:
At the request of Southampton Hospital the council obtained a temporary Wardship Order on Friday, only to direct that Ashya King be presented for medical treatment.
The order will be reviewed by the High Court on Wednesday.
We understand this is an extremely difficult time for Ashya and his family.
Ashya King's parents told the Daily Mail they fled the UK after being told NHS treatments would leave him with life-long disabilities.
The head of the police force which applied for a European Arrest warrant against the parents of Ashya King has now urged their release.
A British mother whose son's life was saved by proton therapy has told ITV that she defied NHS doctors' advice to pursue the treatment.