The NFC West side travel to Florida this weekend to face the Buccaneers, who lead the NFL in interceptions in 2013.
Roman told reporters: "They're playing at a really high level lately. When you turn on the film, these guys are talented and well coached.
"I would just say that they're a high-pressure team, high-volume pressure. Probably more pressure than we've seen all year.
"There's times when they won't pressure, but they create a lot of unrest, get the quarterback off his spot, kind of get him under duress, that kind of thing. And their secondary's playing very well."
49ers quarterback Colin Kaepernick has thrown eight interceptions so far this season.