Jim McInally has slated plans to invite English National League sides into the Challenge Cup and believes it will stop sides like Peterhead from reaching the final again.
The Blue Toon boss guided his side to the final of the competition in 2016 where they played Rangers in front of nearly 50,000 at Hampden.
Since then, however, changes have been made to the format.
Two seasons ago teams from Wales and Northern Ireland were invited into the competition along with sides from the Highland and Lowland Leagues.
And last term teams from the Republic of Ireland were added along with Premiership Under-20s, or colt, teams.
Now, plans are afoot to add sides from England’s National League – the fifth tier of English football.
McInally believes making it a cross-border competition and adding the colt teams has spoiled the Challenge Cup and claims it makes it unlikely League One and Two sides like Peterhead will reach the final.
He said: “You have to wonder who drives this competition because, to me, there is absolutely no sense in bringing in Irish, Northern Irish, Welsh, colts and now two National League teams.
“Somebody would need to explain it to me because I just haven’t got a clue.
“You could have a Scottish final played between two teams not from Scotland.
“Somebody speculated to me in the past that the only reason they do this is so that they can open up a cross-border competition at a higher level at some point.
“If that’s the reason for doing it, it’s pretty sad.
“If that is going to happen it will be because of money and TV deals – it’s never going to happen because the SPFL, in their wisdom, have decided to introduce two conference teams into the Challenge Cup.
“Another problem is, the teams that have been invited into it don’t want to be in it.
“Sligo Rovers last year played Falkirk when they were in the middle of a relegation battle and played the weakest team they could.”
He added: “I think it has spoiled a good competition.
“Even if you were playing a Championship team, sometimes they wouldn’t play their strongest team and it would give you a chance to cause a shock.
“These teams coming into it just makes it tougher and tougher for lower league teams.
“To play at Hampden in front of almost 50,000 in the final was a dream come true for everyone at Peterhead.
“The likelihood is that Rangers won’t be back down again and it probably will never be repeated, so it was a historic occasion.
“Since then they’ve made sure it will never happen again, smaller clubs getting to the final.
“That was the opportunity that was given and that was the best possible scenario – for a lower league team to play Rangers in the final at Hampden.
“Even for lower league teams to get to the semi-finals or final is harder and harder with them introducing these teams.
“I think it’s got to the stage where if you were drawn against a colts team, you’d play your reserve team.”
The SPFL declined to comment.