Grobler has impressed since returning from a long-term injury, recently scoring all three goals in SuperSport's 3-2 aggregate win over Kaizer Chiefs in the MTN8 semi-finals.
Baxter believes Grobler's ability will come in handy on set-pieces against the Mediterranean Knights in a 2019 African Nations Cup qualifier at Moses Mabhida Stadium on Saturday (15h00).
The Brit, though, would have liked the option of deploying powerful forward Mothiba, who is injured according to Ligue One club Strasbourg.
"With Bradley, looking at the way Libya defends, they concede a lot of goals on set-plays," says Baxter, who relied on Grobler when he guided SuperSport to a second Nedbank Cup title in 2017.
"They have conceded a lot of goals on crosses, which is why I wanted Lebo Mothiba also as an alternative. We can start out wider, coming in from one of the flanks.
"We can start with Percy [Tau] and have the big man in the back pocket in case we need to change the game up.
"But it's good news for us that Bradley is firing because Bradley on crosses and balls being feed into the box is a little bit of a predator. And Lebo with his youthful enthusiasm, I was hoping he'll be able to come in.
"Now that's why Bradley is worth his spot in the squad and it is something that we are looking to exploit."
Bafana beat Nigeria 2-0 in Uyo in their Group E opener, while Libya top the pool courtesy of a 5-1 rout of Seychelles.