Middlesbrough head coach Aitor Karanka was unconvinced by Tuesday's 1-0 win against Bolton, describing it as "one of the worst" displays of his tenure.
The result kept second-placed Boro in touch with Championship leaders Derby and three points above Ipswich.
Albert Adomah's first-half goal also ensured a return to winning ways after Saturday's defeat by Leeds United.
"We have played one of the worst games since I came here, and we have won," Karanka told BBC Tees.
"The important thing is we got the three points, and we have to analyse the game.
"I didn't recognise some players and it is difficult for me to understand what went on.
"Every single point in this is very important so to win was important."
Karanka's side have the tightest defence in the division, conceding just 22 goals, leaving Boro with a healthy goal difference of plus 28.
But their tally of 50 goals is the lowest of all the clubs in the top six.
Boro were guilty of missing chances in the Leeds loss, and again in Tuesday's victory against Wanderers, where they had just two shots on target from 11 efforts.
"I'm not concerned, I've said I'm confident in my players," added Karanka.
"We are missing a lot of chances, and in the same way I said individual mistakes is about concentration, the same applies for scoring goals.
"I want my defenders to show concentration, as I do my strikers for scoring goals."