(MENAFN- Kora) The hosts led 2-1 at the break thanks to efforts from Henri Saivet and Cheick Diabate, with Sadio Diallo's equaliser sandwiched between them.
However, Hoarau registered his first goal since returning to France from Chinese side Dalian Aerbin in January to hand Bordeaux a two-goal cushion 18 minutes from time.
Lamine Kone's scrappy effort after 84 minutes proved to be simply a consolation as Bordeaux extended their unbeaten run against Lorient to six matches.
Saivet, scorer of the winner in Saturday's 2-1 triumph over Evian, headed home after 22 minutes, only for Diallo to evade a number of Bordeaux challenges to level four minutes later.
Diabate's left-footed finish ensured that the hosts went in ahead at the break with Hoarau scoring his first goal in France since netting in a UEFA Champions League win over Dinamo Zagreb in November 2012.
Despite Kone registering his opening goal of the campaign, Bordeaux held out for the win as Gillot's side moved seventh in Ligue 1 - five points behind Saint-Etienne in the UEFA Europa League qualification spot.
Lorient have now lost their last three league games and have won just one of their last eight top-flight matches.
Goals from Marco Reus and Henrikh Mkhitaryan in the opening five minutes put the Bundesliga side in control of the last-16 first-leg tie and, although they let Zenit back into the game, last year's beaten finalists remained ruthless in front of goal
Oleg Shatov and Hulk found the back of the net for the hosts, the latter with a penalty, but Robert Lewandowski struck in between to hand the visitors a strong advantage ahead of next month's return leg
Klopp praised the attitude of his side for bouncing back from a league defeat to Hamburg on Saturday, and felt that they were closing to finding their best form
"Today we were close to playing at our optimum level," the head coach said. "The team were sensational, it was a great game
"My side did a great job of closing down the space and carving out chances
"We also knew that Zenit were very dangerous especially when Hulk was on the ball
"We let Hamburg have the game the way they wanted, but it was clear we'd show a reaction tonight.
The two sides face each other again on March 19
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