League One side Port Vale have extended the loan of midfielder Tommy O'Sullivan from Cardiff City until the end of the season, subject to clearance.
The 20-year-old's previous deal concluded following the 1-1 draw with Scunthorpe United on Tuesday evening.
The Wales Under-21 international, who has made just one start, as well as two brief substitute appearances, can now remain with Vale until 3 May.
Manager Rob Page said: "He's a terrific lad and a really promising player."
Vale will be looking for their first win in nine games when they host promotion-chasing Preston on Friday evening.
They have only picked up two points from a possible 24 since their 3-2 victory at Coventry on 7 March and have slid from three points off the play-off spots to just three points above the relegation places.