Manqele netted the opener in Swallows' 2-1 win over Matsatsantsa in the League last month, while he is joint-top of the PSL scoring charts with Kaizer Chiefs' Bernard Parker on four goals apiece.
"We know that he is good and he probably listens to the coach a lot. So we are going to do as much work as we can on trying to contain him," Johnson said of Manqele, who is on loan at the Dube Birds from Mamelodi Sundowns.
"But it is not about Manqele. He can't take the ball by himself, he has to wait for someone to bring it to him. So your first line [of defence] is to stop the ball from getting to him."
Johnson added that he is pleased to see Manqele revive his career after struggling for game-time at Chloorkop last season.
"Manqele was excellent at Free State Stars, he was a very good player," Johnson said.
"In all respect to Sundowns, they took him and never carried on with the momentum.
"What I like is the fact that he is able to revive his career at Swallows.
"His personality, his character is much stronger now because lots of players move from one club to another and die. But he actually proved a lot of people wrong.
"He is proving that he is one of the better strikers in the league," Johnson concluded.