Gibson, the nephew of Boro chairman Steve, is one of the latest off the club's famed conveyor belt of talent and he could be in line to feature against QPR this weekend.
With Seb Hines still short of fitness, Rhys Williams's red card against Bournemouth means Gibson could partner Jonathan Woodgate at the weekend.
However, Mowbray admits he is looking for over - having been linked with the likes of David Wheater, Daniel Ayala and Craig Dawson.
"We have to do something and the players know that," he said. "The team deserve better than losing two or three goals every week.
"It's not a tactical thing, individuals have to stop playing their part in costing us goals. Maybe we need more competition in the defensive areas.
"We did try to do that in the last window but for a few reasons we didn't get that done.
"Seb's still a little bit away and Ben did well when he came on.
"We could throw Ben in and see how he does, but in my mind a player with slightly different attributes would be more beneficial to the team.
"It's not a panic because Ben could do the job, he's a very talented young man. Yet it might be a massive ask for instance, to go to QPR with all their Premier League payers, such as Bobby Zamora and Andy Johnson.
"We'll have to see what this week brings, we'll have a look and see what's available and see if we think there's a player there who can help us do the job and stop conceding the type of goals we've conceded.
"Goalscoring hasn't been our problem in the last few games. We have to stop the flow of goals into our net.
"We've worked pretty hard on that and we have to keep trying to find the answers. They need a break, to win a football match and then win the one on the back of that and you'll see us flying, I'm sure of that."