The former Sunderland goalkeeper will come up against fellow countrymen Henrik Pedersen and Per Frandsen during the tie and says he expects that Bolton will pose his side a threat.
"Bolton have done really well lately. We drew 1-1 earlier this season, they are tougth to score against, there are a few Danish players in there and its a challenge but in a Semi Final anything can happen. We will have to be at our best to go through" he said
Sorensen played a key part in the Quarter Final win over Chelsea for David O'Leary's side when he made an excellent save to keep out a header by John Terry in what was a man of the match performance.