Sunderland's new recruits from the January transfer window have made very positive first impressions at the club.
The Black Cats brought in Wahbi Khazri, Lamine Kone, Dame N’Doye and Jan Kirchhoff last month, to increase the strength of their first team squad.
And Allardyce has admitted that he expected two of the new players to struggle to make an impact at the Stadium of Light.
“The players we’ve brought in during January have had a massive impact in January already,” he said.
“I think they have surprised us all. We expected two to do the business, and two might have struggled a little bit more. But all four of them have made a significant contribution.”
Sunderland have taken five points from their last five matches to climb up out of the Premier League’s relegation zone.
The Wearsiders have put in a series of impressive performances, and their new players have caught the eye.
Kone looks to be a very solid defender, while Kirchhoff has also added steel to Sunderland’s midfield pack.
Khazri, on the other hand, seems to have offered Allardyce’s men a spark of creativity, and N’Doye already has two goals to his name.
Sunderland have now moved into 17th place in the Premier League table, following a draw with Crystal Palace last night, and their next match comes against Southampton at the weekend.