Lovren played 90 minutes in Liverpool's dismantling of Manchester City at the weekend.
Klopp masterminded a famous 4-1 win over Manchester City at the Etihad Stadium at the weekend with Lovren returning to the side in place of Mamadou Sakho - who missed out because of a knee injury he picked up prior to the international break.
He said: “It was the perfect tactical plan from the gaffer.
“We scored four goals and we must have had three or four other one on ones with their keeper.
“It was so intensive - up, down, up, down.
“What’s changed? We are working harder. We are running now more than ever, more than any other team in the Premier League.
“The gaffer has given us a lot of belief. On his first day he talked about having many non-believers around the club, but belief is growing.”
Lovren had a pretty solid and unspectacular return to the side himself, which will be welcome by many Liverpool fans after recent false starts and poor displays gone by, as the Brazilian duo of Philippe Coutinho and Roberto Firmino ripped Manchester City apart, with defensive partner Martin Skrtel rounding off the scoring in style.
With wins like the one at the weekend, it is of little surprise that belief is on the rise in the Liverpool camp. Combined with their win against Chelsea when they came from behind, it must give the Reds a huge lift but they now need to find that consistency to go on a run in order to climb the Premier League table.
Outfoxing top class managers and opposition will be a part of it, but in the manner in which Liverpool took apart City, especially after stewing on a disappointing home defeat to Crystal Palace during the international break, will have been very pleasing to any Liverpudlian.
For Lovren himself, he has to see this little spell as an opportunity to show he has something to offer the side. When the rest of the side is playing as well as they did on Saturday it obviously helps. More unspectacular displays for him with those at the top end of the field doing the business will be just fine for both him and the team.