LAKE FOREST, Ill. -- Bears right tackle Kyle Long felt so despondent about his performance in last Sunday’s 37-34 overtime defeat in Detroit that he apologized to fans via social media.

"I played like dog s--- today," Long's tweet began. "Missed blocks, holding penalties. You should never hear my name. Sorry Chicago. You deserve great."

On Tuesday, Long explained the source of his frustration. The two-time Pro Bowler said he failed to block Lions outside linebacker Josh Bynes in several key situations. The NFL credited Bynes with 10 tackles and two tackles-for-loss in the Detroit victory.

“I let number 57 [Bynes] look like an All-Star,” Long said. “I personally was probably one of their top defenders. If you look at it statistically, two tackles for loss, two holding penalties in key situations.”

Long is particularly upset that Bynes managed to tackle Matt Forte for a one-yard loss on first-and-goal from the 10-yard line on the Bears’ opening drive.

“First drive, they go down and score and we had every intention of going down and following suit,” Long said. “We get into the red zone. I blocked too much on the end. Martellus Bennett and I have the end and the linebacker. And I get too invested in the defensive end. The linebacker sees a free run through. He does that as he’s coached, as he’s supposed to do.

“Nothing against him. We know on film number 57 likes to run through. So you have to be able to see where he is at all times. Because he has the speed to be able to destroy a play. And if you’re helping him out, that’s only making his job a lot easier.”

Long is often his own worst critic. A converted right guard, Long has made only six career starts at right tackle after spending almost the entire preseason on the inside of the offensive line.

“I feel like my play at right tackle is getting better,” Long said. “My pass protection is getting better. I just can’t continue to make the same mistakes in the run game.”