Manchester United boss Jose Mourinho is wary of potential fixture congestion should his team reach the EFL Cup final.
Reaching the February 26 final, however, would mean the Premier League game against neighbours and top-four rivals Manchester City, scheduled for the same day, having to be rearranged.
With both Manchester clubs still in the FA Cup and also due to resume European campaigns in the spring, it is unclear when that fixture could be played.
Mourinho said: "I know that it's going to be hard if we go step by step. If, if, if - we go to the field of the ifs - but if we beat Hull and we play the final then we don't play against Manchester City.
"The match against Manchester City I'm sure they will choose an amazing moment, difficult for us, to make us play against them.
"Then we have Europa League, a non-stop competition. In the Europa League you have to play last 32 and last 16. If we are going to progress it's going to be really difficult.
"Let's see what happens in this moment. In this moment we have a 25 per cent chance to win the League Cup, which is the first competition to be decided."