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It wasn’t an easy game for Chelsea at the Vicarage Road, as Chelsea had to hang in to get the three points.
Mason Mount had scored the opener on the half hour mark, but the home side pulled one back just before half-time.
Chelsea boss Thomas Tuchel made a series of tactical and positional changes to help Chelsea win the game, as he brought on Thiago Silva for Saul Niguez at half-time.
On the hour mark, Hakim Ziyech was brought on to replace the injured Trevoh Chalobah, and Romelu Lukaku came on afterwards for Cesar Azpilicueta.
Tuchel’s changes paid off as Ziyech scored the winner after 70 minutes of play.
Explaining his tactics, the Chelsea manager said: “The goal from Mason didn’t really help us to find the grip and grow into the game. We conceded. We were trying to influence the game from the bench with offensive changes. We lost points against Burnley and Man United. It was 1-1 and we tried to infuse some courage with offensive changes. We hoped maybe the space would open up if Watford continued to attack so bravely with high number eights.
“We decided to keep Puli on the wing-back position and bring Hakim and Romelu on. It’s always good if the guys score. It was very important to hang in and get these three points, and I’m happy for Hakim.”
Speaking more on Saul’s half-time exit, Tuchel said: “He was on a yellow card. We had two options, [the other was to] take Marcos off and put Saul as a wing-back. I had this in my mind before the game if something happened to Marcos, but it wasn’t the right match to try new positions.
“It was him [who went off] to change the shape a little bit and have Thiago on the pitch with the quality of organising, and Trevoh in the six who is more physical. Unfortunately Trevoh injured himself so we ended up with Ruben in the single six. It was a tactical decision and we go on from here.”