JACKSONVILLE – Sen'Derrick Marks' long wait appears over.

A much shorter wait will continue into the weekend for T.J. Yeldon, with his status for Sunday's home game still uncertain.

Marks, the Jaguars' sacks leader last season, is probable and is expected to make his 2015 debut against the Houston Texans Sunday, while Yeldon – the team's rookie starting running back – is expected to be a game-time decision.

Marks missed the preseason and first five games of the regular season rehabilitating from January reconstructive knee surgery.

"I'm very excited – I've been waiting," Marks said as the Jaguars (1-4) prepared to play the Texans (1-4) at EverBank Field Sunday at 1 p.m. "I've been keeping on going, making sure I was prepared, so I'm very excited. …"

"I've been ready. I've been preparing for it. … I feel real good about it."

Jaguars Head Coach Gus Bradley, as he has said throughout the week, said Marks' biggest challenge may be mental as he regains confidence in his knee.

"He is all about it, 'I am up, ready to go,'" Bradley said. "How does he fight through it? Do you see him getting better? Do you see him gain confidence with every rep that he's in? That's the personal battle that he'll be dealing with."

Bradley said while coaches and trainers may not enter the game with an exact play count for Marks, he likely will be monitored closely.

"I think in our head we kind of have an idea what we're looking at, but it will probably be more watching him," Bradley said. "Let's watch him and see, but let's not have it be where he comes off every play, 'How are you doing,' but with a set of plays see where he is at and really watch him."

Said Marks, "There's no telling how many I will get. There's no telling how I will feel on Sunday, so I'm mentally prepared for it."

Yeldon, who missed a third consecutive practice Friday with a groin injury, was the lone Jaguars player listed as questionable on the Friday injury report.

"I would say that's going to be closer to game time," Bradley said. "It will go through the weekend."

Yeldon said the injury continues to progress well.

"We'll see come Sunday; it's still a game-time decision," Yeldon said. "There's a strong possibility I'll play, but it's still a game-time decision."

Bradley said early in the week Yeldon could play despite not practicing during the week, and spoke highly of Yeldon's football knowledge.

"Yeah, I think that's one thing we would watch," Bradley said. "Let's see how he does handle it. All of these things that come up, sometimes you get so caught up in it: you forget about the other things that are on the periphery that are valuable lessons: 'How did T.J. handle it not practicing all week? He played, let's not just stop there let's learn about these guys even more.'

"If it does work out that way it will be interesting."

If Yeldon doesn't play, Denard Robinson and Toby Gerhart likely will share repetitions at running back along with rookie Corey Grant. Robinson was listed as probable on the Friday injury report after missing the last three games with a medial collateral ligament injury.

The Jaguars had mostly positive injury news Friday, with a slew of players with uncertain statuses during the week expected to play against the Texans.

Perhaps most notable aside from Marks was middle linebacker Paul Posluszny being listed as probable. He missed a loss to Tampa Bay last week with a high-ankle sprain.

Also listed as probable on the Friday injury report:

Quarterback Blake Bortles (right shoulder), offensive lineman Luke Bowanko (stinger), cornerback Aaron Colvin (shoulder), defensive tackle Abry Jones (knee), Marks, offensive tackle Jermey Parnell (knee), Robinson, tight end Julius Thomas (hand), offensive tackle Sam Young (illness), cornerback Davon House (hip), wide receiver Allen Hurns (ankle/thigh).

Safety James Sample was listed as doubtful with a shoulder injury while wide receiver Marqise Lee (hamstring) and running back Bernard Pierce (concussion/hamstring) were ruled out.