Main's month from Championship side Middlesbrough is up but Burke was thought to be staying at the Greenhous Meadow until January on a youth loan.
But the Aston Villa attacker's terms were open-ended with the Premier League club, with an on-going option allowing the 20-year-old to leave.
It leaves Town's with just one fit striker, although John Marsden is on his way back from injury as he recovers from a broken foot.
Meanwhile, midfielder Paul Parry could be back in the team for this weekend's home clash with Carlisle.
Parry has missed the last two games, against Wolves and Bradford City, after limping out of their previous match against Bristol City with a hip injury.
But the 33-year-old former Cardiff City, Preston North End and Hereford United player has been working hard to get himself back to fitness this week.
And if he comes through training tomorrow with no ill effects, he will be under consideration for a return to action at the weekend.
Turner said: "He's been doing a fair amount of physical work and I expect him to be in with the squad again tomorrow.
"We will see how he goes for the rest of the week."