New father Lonergan’s “world class” save from former Trotters loanee Jacob Butterfield early in the second half tipped the contest Bolton’s way.
“The first goal was always going to be crucial and that looked a goal for me,” said Lennon.
“It was a brilliant save and that’s why I congratulated Andy after the game.
“Sometimes these things get overlooked. He is in the team to make saves obviously but that was pivotal.
“When you are trying to be consistent and trying to win things, you need your goalkeeper. I had a great one at Celtic (Fraser Forster) and Peter Schmeichel did it for years at Manchester United.
“I hope Andy continues in the same form. All good teams have great goalkeepers. I am not saying Andy is great by any means but he has been excellent since I came in. He is brave and a better goalkeeper than I thought.”
Powell said: “That save was the turning point. It was quite even in stats.
“A similar chance for Bolton goes in and ours hits their ‘keeper. We just have to dust ourselves down and believe we are doing the right things, even though results haven’t gone our way.
“I have a disappointed changing room because we were very much in the game.
“It’s a game you look to take something from because of the position of both teams (Bolton’s win took them above Town on goal difference).
“We knew Bolton had an uplift in form since Neil came in (to replace Dougie Freedman), but we felt comfortable coming here and playing the way we did. The chances were there for us to take something.
“I think a draw would have reflected the whole game.”
In-form striker Craig Davies scored his fifth goal of the season after 67 minutes to settle the outcome of a dour contest and means Bolton have won all four home games since Lennon’s arrival.
Davies hit the bar in the first half and his six-yard tap-in ensured Huddersfield have now gone four games without a win.
Bolton Wanderers: Lonergan, Vela, Mills, Dervite, Ream, Danns, Pratley, Feeney (Hall 87), Lee, Clayton, Craig Davies. Unused substitutes: Bogdan, Moxey, Spearing, Mason, Trotter, Threlkeld.
Huddersfield Town: Smithies, Smith, Hudson, Lynch (Wallace 46), Robinson, Butterfield, Coady, Poyet (Lolley 76), Scannell (Ward 90), Holt, Wells. Unused substitutes: Dixon, Hogg, Allinson, Peltier.
Referee: Carl Berry (Surrey).