CELTIC are keeping an eye on Barnsley midfielder Callum Styles ahead of the transfer window reopening next month, according to reports.

Manager Ange Postecoglou has already outlined his desire to strengthen his squad once the market is open and the Greece-born Australian's resolve will have only been reinforced in recent weeks as his players have picked up injuries.

The former Yokohama F. Marinos boss is expected to raid Japan in January and Celtic have been heavily linked with moves for forward Daizen Maeda, utility man Reo Hatate and midfielder Yosuke Ideguchi.

However, the Scottish Sun are reporting that Postecoglou is also looking south of the border for new recruits as he weighs up a move for Styles.

The 21-year-old came through the ranks at Bury before sealing a move to Barnsley in 2018, where he has racked up over 70 first-team appearances.

Styles has featured mainly in midfield for the English Championship club but has also been deployed as a left winger and a left wing-back on occasion during his time at Oakwell.

Postecoglou has been 'checking' on Styles, according to the Sun, and the Celtic boss could make his move for the Englishman in the January window with the Tykes embroiled in a relegation dogfight.