Red Bull Salzsburg striker Samuel Tetteh is increasing the work in training to regain full fitness before the start of the season.

The 20-year-old has re-joined the Austrian champions for pre-season but yet to kick a ball.

He is yet to attain full fitness after undergoing surgery in February to correct a knee injury.

Tetteh scored 10 goals in his first 20 games for FC Liefering and was immediately promoted to the first team before the injury setback.