Assistant coach Salim Ali took charge of the first session of preseason training.
It will be the first time Mathare United will be facing a coastal club on match day one.
Nyakeya equalised from the spot with only a minute left to play.
Juma returns from suspension to replace Omurwa who drops to the bench.
Mathare United will be chasing a top four finish against Gor Mahia on Wednesday.
Chris Ochieng' scored the lone goal to secure the away win.