But Chelsea battled back after the half-time break and goals from Mason Mount and Callum Hudson-Odoi handed them a lifeline before Tammy Abraham scored the equaliser in injury time.
Werner is still searching for his first Premier League goal since joining Chelsea in the summer and the German striker says he has mixed emotions following the draw against West Brom.
In a post to Chelsea fans on Instagram, Werner wrote: ‘We never give up Chelsea! Absolutely unhappy with our performance but great fighting spirit.’
Meanwhile, Mount wrote on Instagram: ‘We know we can be better, but we dug in and showed character to get back in the game!’
Lampard also said he was unhappy with Chelsea’s defensive play in the first half but was pleased with his side’s response.
‘The lads did show great character to overcome that but at the same time it’s not a position when you come somewhere where the team are organised and want to make it difficult for you and we gave them three goals so I’m left with mixed emotions,’ said the Chelsea manager.
‘I was happy to see my team fight to the last minute to get the goals back but I have to go back to beginning and not be happy with the fact that we conceded three goals from three shots on target.
‘In a competitive squad with people who want to play, you always want there to be hunger in a positive fashion. It’s great to see the reaction of Callum coming on and playing the way he did, making a difference and Tammy as well.
‘It was a difficult game for Tammy today where he has to keep working and fighting all the time to try and break down a back five that want to sit deep but he gets his reward at the end so there were positives there.’