Werner appeared to be fouled by Ricardo Pereira in the first half, with the forward having already seen a goal ruled out for offside and again later for handball.
“It’s a clear penalty,” Tuchel told Sky Sports. “These VAR decisions, frankly, are horrible against us. This is the third time in a row.
“We had a goal against Arsenal, we had a goal against Leicester. It has to stop of course, but we weren’t worried at half-time. “
Tuchel was asked about Werner’s performance, the reporter noting that the striker was “involved in everything”.
“It’s his job to get involved in everything and he has to be involved again on Sunday,” Tuchel replied. “Now is not the time to give extra praise. Take advantage, shut up, enjoy your day off and get ready for Sunday.
The Blues took revenge on Leicester after Saturday’s loss in the FA Cup final, winning 2-1 at Stamford Bridge for all but confirming their top-four spot and casting doubt on the Foxes.
Tuchel says his Chelsea players won’t be celebrating until the Champions League final.
He told BBC Sport: “It was a solid performance and a well-deserved performance.
“No time to celebrate, the job is not yet done, there are still two games to go. Very happy to play in front of the fans, it was a huge difference today. “