The Magpies signed Henri Saivet, Jonjo Shelvey and Andros Townsend permanently during the January transfer window, while Roma forward Seydou Doumbia joined the club on loan until the end of the season. And Lascelles hints that the quartet have already had a positive impact on the squad.
When asked about whether the arrivals have lifted the side, the defender told the Chronicle: "Definitely. Obviously with the English boys it’s nice to have them around as well.
"In Andros and Jonjo we've brought in two big characters which I think we needed.
"I think we've lacked a bit of leadership and a bit of determination on the pitch recently.
"So they've definitely given us a bit of a lift and hopefully we can get three points against Chelsea."
While the first game after the closure of the window suggested that perhaps the vast amounts they had spent during the month were invested in the wrong areas - as they fell to a humiliating 3-0 defeat to Everton, which also included Lascelles being dismissed - they hinted in their most recent clash that they may gradually be heading in the right direction.
Not only did the 1-0 win over West Brom bag Steve McClaren's side a valuable three points - which also lifted them out of the bottom three - but it was also just their fifth clean sheet of the campaign.
The victory over the Baggies suggested that the club's new signings have started to make the Magpies much more difficult to beat, and with Lascelles claiming that their arrivals have boosted the squad, supporters may now have some confidence that safety will be secured in the future.