Graham Potter felt his side did well against Chelsea at the Amex on Monday but that they need to do better in both boxes.
Having got back on level terms through Leandro Trossard, after Jorginho opened the scoring from the penalty spot, Reece James lashed an effort into the top corner before Kurt Zouma’s deflected strike sealed the visitors’ 3-1 win.
Potter said, “Unfortunately if you concede three goals you make it difficult. The manner of the first goal is a mistake, and came after we probably had our best attack of the half.
“We had to recover and responded really well to get the equaliser. Their second goal was a bit of a wonder strike, but we could still do a little bit better ourselves and the third one is a little bit harsh but we’ve still got to do better.
“It was a good performance overall, but a disappointing result.”
Tariq Lamptey was a standout performer throughout the evening and his boss was pleased with Albion’s man of the match.
“Tariq put in a very good performance,” Potter added. “He’s a fantastic boy – he’s got some excellent attributes and he can affect the game.
“He’s only 19 and he has still got a lot to learn but his feet are really on the ground and he wants to do better – he’s great to work with.”
Both Adam Lallana and Ben White made their Premier League debuts for Albion, but went off injured with Potter hopeful their knocks are not serious.
“It’s too early to give a definitive answer on either of them,” added Potter. “Adam was enjoying the game and his performance. It’s early days, it might just have been cramp.”