It had been reported that the 26-year-old was the subject of interest from a number of Championship clubs.
"Just to clear it up. My main focus is to help Pne to get bk into the championship. It's a championship club in league1," he wrote on Twitter. "Looking forward to getting bk to training and working hard. Iv got a year left and am very happy were I am at the moment."
Humphrey joined Preston from Scottish side Motherwell last summer.