"Alcohol is starting to take hold now and we expect more people to be detained during the night," a police spokesman said ahead of the Group B match at the Rhein-Energie-Stadion.

Under German law police can detain individuals for threatening behaviour or if they suspect they are likely to commit a crime.

Tens of thousands of England and Sweden supporters are expected in the western German city to follow Tuesday's match which begins at 2100 local time (1900 GMT).

Thousands have already arrived and spent Monday night drinking and revelling in Cologne's old centre and along the banks of the river Rhine.