Languishing 15th in the Premier League, Arsenal attempt to end a seven-game run without victory. Chelsea, meanwhile, will move within three points of leaders Liverpool with a win.
Leicester and Man United drew 2-2 at the King Power Stadium. United twice led, but the Foxes fought back on both occasions with an 85th-minute Axel Tuanzebe own goal earning a point.
Manchester United lost three cup semifinals last season, and now in the final four of the Carabao Cup, Ole Gunnar Solskjaer needs to bring a trophy back to Old Trafford.