TAMPA, Fla. -- Running back Doug Martin didn't participate in the Tampa Bay Buccaneers' practice Thursday because of a knee problem, but coach Lovie Smith downplayed the severity of the injury.

"He should be OK," Smith said.

Smith said Martin hit his knee in practice Wednesday. Martin was the only addition to the Bucs' injury report Thursday, with cornerback Johnthan Banks (knee), tight end Austin Seferian-Jenkins (shoulder), center Evan Smith (ankle) and tight end Luke Stocker (hip) not participating for the second straight day.

Martin leads the Bucs in rushing this season with 176 yards on 46 carries.

In other injury news, Tampa Bay upgraded offensive tackle Donovan Smith (knee) to limited participation Thursday after he didn't practice Wednesday. Safety Chris Conte, who was limited Wednesday, also was upgraded to full participation.

Defensive end George Johnson (neck), defensive tackle Gerald McCoy (shoulder) and safety Major Wright (abdomen) were limited for the second consecutive day.