The 18-year-old's initial one month loan spell at Boundary Park was due to end after the Latics League One game against Port Vale this weekend but the young midfielder will now remain at Brian Talbots side for at least another month.
Kilkenny, who celebrates his 19th Birthday this coming Sunday, has made 5 starts for Oldham during the last month and has bagged 4 goals.
He played through the pain-barrier in the Latics 2-1 home win against Huddersfield last weekend having picked up a dead-leg in their previous fixture against Chesterfield.