Jason Cundy was disappointed in Chelsea’s play because it lacked a finishing touch.
Chelsea Online News:

Graham Potter‘s Chelsea team have the same problem as his previous Brighton team; nobody can finish their chances.
After Wednesday night’s Champions League loss against Borussia Dortmund, pundit and former Blues player Jason Cundy said it was “frustrating” to watch his old team.
Before Karim Adeyemi’s second-half winner, Chelsea had a number of scoring opportunities, but Joao Felix in particular let those chances slip away.
“If we play the same [in the second leg] and we don’t score we’re out,” Cundy told talkSPORT. “Simple as that and football will never change. It’s so frustrating to play as well as we did.
“I think this is like watching Potter’s Brighton. [The] chances they create, play well and don’t put the ball in the back of the net. Honestly, it’s so frustrating. The frustration of watching Chelsea play tonight.
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“I think this is like watching Potter’s Brighton. [The] chances they create, play well and don’t put the ball in the back of the net. Honestly, it’s so frustrating. The frustration of watching Chelsea play tonight.
“I don’t care how much money we spend, spend more! We need a striker and you need someone that can put the ball in the back of the net.”
Only four sides scored fewer goals than Brighton did under Potter’s management in the Premier League last season, while Chelsea are ranked 13th in the table so far.
Blues manager Potter said he was pleased with many parts of his team’s play despite the loss and lamented a lack of “luck” and “execution” in front of goal.
“Overall, we were pleased with the performance for big parts of the game,” he told reporters.
“It is complicated away from home in the Champions League, in a hostile environment against a team that’s in a good moment. It was an even first half, we managed the game quite well with good opportunities to counter-attack and we hit the bar.
“Then in the second half apart from the one decisive action where we didn’t do well enough, we were the dominant, the better team and created some good chances.
“We needed a little bit of luck maybe and a little bit of final execution. We deserved a goal but have to keep going. It’s half-time. It’s a tight tie. We look forward to Stamford Bridge.”