Martin had been expect to miss at least four games after picking up a groin injury against Southend United but has returned to training sooner than expected after a quick recovery while Smith played sixty minutes in Tuesday's reserve game without a reaction to his long-standing knee problems.
Dave Brammer and Alan Dunne are also in contention.
"This is a massive game for us," Jackett told the club's official site. "I've made a lot of changes in January and with other players returning to fitness I'm convinced we'll develop into a good side.
"We'll need every ounce of our supporters' energy behind the team for this one, but having said that the onus is on us to put in a performance, play well, be constructive, defend properly and battle like it means everything to us, which it does. Then the fans will get behind the side and create a terrific atmosphere."