200 police officers on patrol for Wolves' derby game at Shrewsbury

The match, which is being played at Shrewsbury's Greenhous Meadow ground, is expected to attract to a sell-out crowd of more than 9,000, and West Mercia Police have decided to mount a large-scale operation in a bid to avoid clashes between supporters.

Officers from West Mercia and Warwickshire forces will be drafted in, with expert 'spotters' from West Midlands Police being used to identify known trouble makers.

Chief Inspector Dave McWilliam, the match day commander, said: "It is important we have sufficient officers in and around the ground to support club safety staff, as well as in Shrewsbury town centre to deal with any outbreaks of disorder.

"We are hoping the day will not be marred by trouble but anyone causing problems or involved in disorder is likely to be arrested."

He said fans of both sides hoped to enjoy the game without fear of violence. He added: "This is a special sporting occasion and real fans will want to enjoy it without disturbance.

"We also want to ensure others in Shrewsbury can go about their business without interference."

Wolves spokesman Matt Grayson urged supporters to arrive at Saturday's game early.

He said: "We sold out of our 1,500 ticket allocation last week. It is expected to be a sellout game so naturally there will be congestion around the ground. It is a 1pm kick off so the advice is for supporters to arrive at the stadium earlier."

Mr McWilliam said the match was all-ticket and kick-off had been brought forward by Shrewsbury Town FC to 1pm.

He added: "We are working very closely in partnership with Shrewsbury Town FC who will have a large number of stewards on duty in the stadium.

"The police will not tolerate anybody arriving at the stadium or in the town with the intention of engaging in disorder."