"The schedule is coming along just the way we all thought it would be – on track pretty much. I feel like I am pretty ahead of where I should be, and I am just going to keep working," Walker said. "I have three more months until I am fully recovered. I just have to keep trusting the process, and try and get better for next year.

"My goal is to be ready for OTAs, but I am not sure what they are going to have me do. I don't think they want to rush this, knowing what time of injury I had. I want to be able to run and catch balls and run routes (in OTAs), but we'll see what happens."

Walker, 34, knows some will doubt whether he can make it back to pre-injury form. He's heard it before, he said.

Walker was voted as a captain by his teammates before the start of his 13th NFL season. He was named to his third straight Pro Bowl in 2017 after he led the team with 74 receptions for 807 yards and three touchdowns.

In his career, Walker has caught 483 passes for 5,673 yards and 34 touchdowns. He played his first seven seasons with the San Francisco 49ers before signing with the Titans prior to the 2013 season.

"I don't really remember how old I am," Walker said with a smile. "They can judge me all they want. I already know people are going to say it's going to be a struggle to come back off an injury like this. … They doubted me before and look how far I got. I am just going to prove everybody wrong.