For all the stick that the Barcelona defense gets, they played at a high level on Wednesday night. Javier Mascherano was composed and Adriano knew when to stay back.
But the best defensive performances came by the two players who needed it most.
Martin Montoya was absolutely spectacular against Celtic. He gave an assist, was a force going forward and made four tackles. So far he has not showed his best this season, but against Celtic he was flawless.
Gerard Pique may be one of the most talked about defenders in the world, and it isn't because of his talent. Over the past year or so the Catalan has found a knack for making mistakes and costing his team.
That wasn't the case against Celtic.
Besides Neymar, Gerard Pique was Barcelona's best player on the night. He scored a goal, won the ball back countless times and headed away a shot that was headed for an open goal.
Pique has been much better this season than he was the year before, but he still hasn't been at his best. However, on Wednesday he showed just how good he can be and Barcelona fans will be hoping that is a sign of things to come.
It should be mentioned that the defense faced a very disappointing Celtic side, but this is the Champions League and a good performance is a good performance.
Their only blight was giving up the clean sheet with a late goal.