Austin has scored 18 goals in 15 games for the Championship club this season and with Premier League clubs expected to circle for the in-form striker in January, Dyche has admitted that the club are 'realistic' about the 23-year-old's future.
Dyche told BBC Radio Lancashire: "Things like that are out of our control for starters.
"We've had it many times with many different players. Last year, we sold Marvin Sordell at Watford.
"This club's got a different financial platform, a different financial thinking, but it's still got reality."
The 41-year-old boss will see his new side face Wolverhampton Wanderers on Saturday.