Coventry City say they are extremely disappointed by a last minute change to ticket arrangements for tomorrow's trip to Grimsby.
Thay had anticipated fans being able to buy a ticket on the day - but that is now not the case.
The club say they have written to bosses at Grimsby about this - but say fans without a ticket should not travel on Saturday (Aug 12th).
Sky Blues Chief Exec Dave Boddy said: “I have written to the Chief Executive at Grimsby to express our extreme disappointment at this decision and the late notice of it.
“This has caused the Football Club and more importantly our supporters severe inconvenience.
“This letter is not directed at the club personally, but I have also asked Grimsby to forward our disappointment and concerns to their Safety Advisory Group, Police and local council, as we believe it is unacceptable to make such arrangements so late in the day.
“While I appreciate Sky Blues fans will be very keen to go to the game and support the team in our first away match of the season, I would ask that if you have not purchased a ticket in advance you do not travel to the game.”
Around 1,350 tickets have been sold to Sky Blues supporters for the match.