Coutinho is believed to have handed in a transfer request on Friday, just hours after Liverpool owners Fenway Sports Group released a statement in which they insisted they would not entertain offers for the Brazil star.
"I didn't like the first 25 minutes of the second half".
The Reds twice trailed at Vicarage Road as Stefano Okaka and Abdoulaye Doucoure took advantage of some extremely slack defending - either side of Sadio Mane's first goal of the campaign - to send the Hornets into the break ahead.
The visitors' 3-2 lead held up until the fourth minute of what turned out to be eight minutes of extra time, when an unmarked Britos nodded home a corner to dash Liverpool's hopes of becoming the second winners of the young season. But it already will feel better because it's one point and I saw a lot of good things.
"I can't say anything about it, the only thing is I work with the players I have".
Quizzed about the situation following the Watford match, Reds boss Klopp maintained Coutinho's future is out of his hands. Players who have moved after putting in a request in recent years include Xabi Alonso, Fernando Torres, Gareth Bale, Raul Meireles and Nicolas Anelka.
"What I can say, as manager in a football club, I have bosses". So how it change something for me?
"You have to ask the club".
"It was similar last season and I think it will happen again this season", he added.
"You have to ask them".
"He was involved in the penalty, and scored a goal", Klopp said.
Klopp was pleased with Salah's second half display following the Egypt winger's club record £34 million move from Roma.
"We had our moments, then we conceded an offside goal", he said. "Hard to accept. But we know we can do better and we have to do better". "We had a very good first half, a good intensity like I wanted", he told BBC Sport. They will be good on the counter attack against the good sides - I think they'll get good results.