Roberto Martinez 's side won 2 - 0 at Sky Bet Championship side Middlesbrough on Tuesday .
Roberto Martinez 's side must now see off high - flying City to keep alive the possibility of an all - Merseyside Wembley final and secure their first League Cup triumph .
Roberto Martinez 's side won 2 - 0 at Sky Bet Championship side Middlesbrough on Tuesday but must now see off high - flying City to keep alive the possibility of an all - Merseyside Wembley final and secure their first League Cup triumph .