Still, Munchak is optimistic Locker will be back this season.
The coach said Monday that Locker will have another MRI exam Tuesday to diagnose the extent of the injury, giving the Titans a better idea of when he can return. Munchak also says any reports on how much time Locker will miss is simply guessing now because the Titans haven't discussed the possibilities with the quarterback yet.
"He still has swelling so they don't want to speculate on terming what that means or how long and rehab and how long this all will take," Munchak said. "He'll be MRI'd again tomorrow, then we'll have a better idea exactly what the time frame before he can actually play or get back on the field."
Munchak said Locker sprained his right knee on the hit.
Ryan Fitzpatrick now will replace Locker in Sunday's game against Kansas City (4-0).
The coach did not rule out a fracture or dislocation until after the next tests. Munchak dismissed reports earlier Monday that Locker will miss at least a month, saying that determining the severity of an injury can be difficult early. He also said the Titans will announce how long Locker is out after Tuesday's tests.
"Then we'll have to make some decisions and see exactly where we're at," Munchak said.
Locker spent the night in the hospital after being injured early in the third quarter of a 38-13 win over the New York Jets. Locker was hit first by Muhammad Wilkerson and pinballed off Quinton Coples before grabbing at his hip as he went to the ground. Munchak said Locker couldn't pull out his foot with his hip caught in a kind of whiplash effect.
Munchak talked with NFL officials Monday about the hits.
"The first one was he dropped his helmet into him and unloaded on him, which you're supposed to pull back when you're late. The second one was totally unnecessary," Munchak said.
Locker was released from the hospital Monday morning and had treatment at the Titans' headquarters before going home.
"I want to thank everyone for their thoughts and prayers over the last 24 hours," Locker said in a statement released by the team. "I am going to work as hard as I can to get back as soon as I can. I believe in this team and will do whatever I can to help us win in the meantime."