By Mike Keegan For Mailonline
Published: 09:28 GMT, 7 January 2020 | Updated: 09:28 GMT, 7 January 2020
Concerns have been raised that the decision to cut the away allocation at Tuesday night's Manchester derby on safety grounds may actually end up triggering trouble.
Last month, in a controversial move, United and City decided to slash the number of tickets available for away fans for each leg of their Carabao Cup semi-final.
Each club has been given a visiting allocation of around 3,000 – far less than what they were entitled to under competition rules.
There were plenty of empty seats at United's Carabao Cup quarter-final with Colchester but the prospect of a derby with City hasn't captured the imagination either
Tickets were readily available on general sale on the morning of the first leg at Old Trafford
The first leg takes place at Old Trafford on Tuesday night, but United have struggled to sell out.
Tickets are now effectively on open sale – prompting fears that City fans will take the opportunity to buy seats in home sections