The Texans have three veteran quarterbacks in Ryan Fitzpatrick, Case Keenum and T.J. Yates, but they are still widely expected to select one in the draft first overall.

Blake Bortles, Johnny Manziel and Teddy Bridgewater are the highest-rated quarterbacks.

“We’re going to bring some of these guys to Houston to spend a day with them,” O’Brien said about the quarterbacks and other prospects to be the top pick. “There are other quarterbacks in the draft.

“Being a quarterback coach, it’s important to note there are a lot of quarterbacks who are winners and have played well. My opinion is that I see strengths and weaknesses with every one of these guys. I don’t see one, two or three guys who are light years ahead of the rest.”

The Texans are unlikely to start a rookie at quarterback in Week 1.

“It’s very difficult to play a quarterback right away,” O’Brien said. “Expecting a rookie to go in and play right away against, say, a Rex Ryan (New York Jets) defense, is very, very difficult. At the same time, you better be ready to do it because you never know what’s going to happen.

“What we’re trying to do is to set up a very competitive roster at every position. Through the spring and into camp – at every position – we want a very competitive roster. Let these guys win their positions on the field. If a guy’s got to play as a rookie, then that’s what we’ll do.”