Defending champions Association Sportive de Sale edged out Nigerian side Civil Defenders with a 165-146 win on aggregate.
With the first leg ending in a draw 69-69 two weeks ago in Nigeria, it was an open tie for the two teams with the winner advancing to the last four.
Najah who missed out of the first leg in Abuja, Nigeria two weeks ago to injuries, was instrumental for Sale at both ends of the court.
The AS Sale forward finished with a game high 27 points and nine rebounds in 28 minutes of play and was a handful for most part of the game.
The Nigerian side showed resilience and were very difficult to break down in the first half of the game and trailed by just 4 points at half time (49-45).
Defenders caused the host to turn over the ball 13 times before half time, going neck to neck with the champions while shooting 9 three pointers in the first half.