Mahlasela failed to make a single appearance at parent club Chiefs this season and has been loaned to Rise and Shine for the rest of the season.
It remains to be seen how long it will take the 28-year-old to adapt to his new environment.
"I worked with Kabelo before [at Bloemfontein Celtic] so I know what he can give the team, and we were looking for a player of his quality to come in and help the team," Larsen tells KickOff.com.
"You know these next five, six games for us are very important and I believe that a player like him can have a big impact.
"I don't [think he will need some time to adjust at City], players like him don't need time. You can see the way he plays he can adapt very, very quickly to any situation.
"I know the player and I know his versatility. He can play in a few different positions as well, which is something that attracted us to bringing him here. He can play as a 10, he can play off the right, off the left which we like. He gives us lot of options."
Larsen was asked if he had any idea why the player failed to break into the Amakhosi team.
"That's a question for the coaches there, I've got no idea why he was not playing but I do know that every time he did play, I saw him play quite well," he replied.
"So for us we are bringing in a quality player to strengthen our team. He's in good spirits. He's eager to get going to play again so we can't wait to see what he can produce."