The npower Championship side travel to Swansea in the last eight on Wednesday night hoping for a repeat of their victory over top-flight opposition in the last round at neighbours Sunderland.
However, if they are to achieve that, they may have to find a way to stop striker Michu, who has made a blistering start to his career in England.
The 26-year-old Spaniard, a £2million summer signing from Rayo Vallecano, currently leads the top division for goals scored having plundered 12 already, and that makes him a major threat to Mowbray's men.
The former central defender said: "He plays in that 'ghost' position behind a striker, and who's marking him?
"He can drift into areas and he's got a fabulous intuition to get into goalscoring areas unnoticed.
"He's a big physical presence, so he can jump over the top of people, he is obviously very clinical with his finishing.
"For £2million, you would have to say he has been just about the buy of the season.
"We will get a feel of him tomorrow - I am sure he will be playing and we will feel ourselves the threat he poses."
- Sports & Recreation
- Rayo Vallecano