Maurizio Sarri was unimpressed with Chelsea's ponderous performance against BATE despite a 1-0 win securing his team's passage to the Europa League knockout rounds.
Olivier Giroud's first goal in 794 minutes of club football was one of few positives from a lethargic display that could well have cost the Premier League side.
BATE were denied by the woodwork three times, including once in stoppage time as the hosts went within inches of rescuing a result in frosty conditions.
Chelsea ultimately clung on to move within a point of confirming their status as Group L winners, although their coach was left concerned.
"We didn't play very well. I didn't like the first half because we moved the ball only slowly," Sarri told reporters.
"It was very difficult to be dangerous, but we were better in the first 25 minutes of the second half. We didn't manage the last 15 minutes well.
"The best thing is the result. It wasn't very easy to play a good game here, with the conditions."
Giroud's well-judged header from Emerson Palmieri's cross in the 52nd minute did provide Sarri with the rarity of two strikers in scoring form following Alvaro Morata's brace in the weekend win over Crystal Palace.
The goal opened Giroud's account under the Italian and was his first for Chelsea since May.
"I am pleased for him. He is very important for us," the Blues boss said.
"I know very well a striker wants to score. For his confidence it is very important."
France striker Giroud insisted he lost no belief in his ability during the drought.
"I maybe lacked a bit of efficiency and a bit of luck sometimes, but you always need to keep working hard in training and keep the faith," the 32-year-old told BT Sport. "That's what I did tonight."
|Bryan backs Murray to return after hip resurfacing surgery|
|Scotland coach Townsend turns to trio of uncapped hookers|
|Spurs´ Aurier arrested on suspicion of assault, released without charge|
|That was a fireworks show - Warriors revel in record-breaking first quarter|
|We are in talks with Chelsea – Salihamidzic reiterates interest in Hudson-Odoi|
|´Proud´ Messi recognises impact of team-mates after reaching 400 LaLiga goals|
|Henry v Vieira: The Arsene Wenger proteges to move into coaching|
|Federer enjoys ´cat and mouse´ win over Evans|
|Wozniacki cruises through in Melbourne|
|Federer maintains perfect Australian Open second-round record|
|Warriors set NBA record, Butler´s 76ers rout Timberwolves|
|´I like the fact we beat them´ - 76ers´ Butler revels in win over Timberwolves|
|Murray says he´ll ´probably´ have operation|
|Australian Open tribute for Andy Murray surprises brother Jamie|
|Warriors score NBA record 51 points in first quarter against Nuggets|
|Panthers owner Tepper doesn´t rule out Newton missing 2019 because of shoulder injury|
|De Ligt will be world´s best centre-back – Koeman|
|Ronaldo a ´perfect machine´, says Gattuso|
|Barcelona? I can´t say anything - Stuani|
|Silva upbeat about Man City title chances|
|Celtics youngsters say Irving´s callout ´came from a good place´|
|NFL playoffs: Patrick Mahomes v Tom Brady|
|NFL playoffs: Jared Goff v Drew Brees|
|Sixers sign Brewer to 10-day contract|
|Lozano and Morgan scoop CONCACAF awards|
|Lakers ´optimistic´ about LeBron injury|
|Giants produce mammoth fourth quarter against Nymburk|
|Austin FC to join MLS in 2021|
|Henry, Vieira look forward to reunion when Monaco host Nice|
|Barcelona reject Neymar phone call reports|
|Wentz is the quarterback ´going forward´, says Eagles coach Pederson|
|Gattuso: Higuain has not asked to leave|
|Drew Brees by the Opta numbers: 10 facts for QB´s milestone birthday|
|Harry Kane injury: England captain´s history of ankle woe|
|Harry Kane injury: Opta numbers suggest Spurs struggles|
|Harry Kane injury: Tottenham´s options in striker´s absence|
|Allegri: Supercoppa clash practice for Champions League knockouts|
|First in clean sheets, second to Schmeichel in titles – Cech´s Premier League career in Opta numbers|
|Warrington sign England star Widdop|
|Gatland confident Wales can win Six Nations|
|Fulham sign Netherlands international Babel|
|Harry Kane injury: Games the Tottenham striker will miss|
|Simeone focused on matches, not transfer dealings|
|Iran v Iraq: Pressure off for Queiroz & Katanec|
|Vietnam v Yemen: Kocian keeps the faith|
|Darren Bravo back in West Indies Test side for first time since 2016|
|Kane out until March with ankle injury|
|South Korea v China: Son arrives for Group C dead rubber|
|Kyrgyzstan v Philippines: Eriksson remains hopeful|
|McGrath to miss Six Nations, Sexton nearing fitness|
|Kohli savours Dhoni ´classic´|
|Ford: People obsess over Farrell fly-half battle|
|EFL asks Leeds to explain ´spygate´ scandal|
|No alarms for Djokovic and Zverev, Raonic masters Kyrgios|
|Australia 3 Syria 2: Rogic breaks hearts with stoppage-time winner|
|Palestine 0 Jordan 0: Socceroos winner keeps hopes alive for Lions of Canaan|
|Halep: The results don´t matter any more|
|Hard work for Halep as Serena and Osaka sail through|
|Napoli director to take legal action over ´false´ quotes about Rog move|
|Alexander-Arnold facing absence of up to four weeks|
|Solari: We only have one number nine at Real Madrid|
|Halfpenny & Young named in Wales´ Six Nations squad|
|Crawford v Khan confirmed for April 20|
|Centurion Kohli inspires India to level ODI series|
|Wagner hails Huddersfield togetherness after exit|
|Hughes to join Bristol, Le Roux also leaving Wasps|
|ICC appoints Sawhney as new CEO|
|Forest appoint club legend O´Neill as new manager|
|Halep digs deep to gain revenge over Kanepi|
|Cech to retire at the end of the season|