Bak, 33 was selected by his native Poland in this years World Cup in Germany. Sadly for the Polish they failed to live up to expectations and after a heavy defeat to Ecuador were dumped out of the competition at the group stages.
The 75 capped (scored twice) international made his debut in 1993 against Cyprus and along the way to the World Cup was made captain in several qualifying matches.
A Defender/Midfielder who lists Olympique Lyon, RC Lens (both French clubs) and Lech Poznari (Poland) as his former clubs who cost United the region of £250,000 from Qatar outfit Al-Rayyan Club, for whom he plays his club football.
The 194 (cm) tall defender started his playing career in 1991 at Poznari, winning the league title in his first season. Whilst at Lech he was spotted by the Polish coach who awarded him with his first cap.
He joined Olympique Lyon in 1995 but failed to make an impression in the French league due to sustaining many injuries, he signed for Lens in 2002 and moved to Al-Rayyan Club in 2005.
Meanwhile the Blades are interested in signing Burnley Midfielder Graham Branch. The 34 year old is apparently linked with Blackburn Rovers and Charlton Athletic, but it is believed that he would snub moves to Ewood Park and The Valley to play at Bramall Lane.
Burnley signed Branch from rivals Stockport County in January 1999 and has since gone onto make 232 (+ 61 as a substitute) appearances for the Clarets whilst netting 17 goals. He lists Heswell Athletic, Tranmere Rovers, Bury and Wigan Athletic as his former clubs.