Mauricio Pochettino was disappointed with the second-half performance from Southampton after losing out to Tottenham 3-2 at St. Mary's Stadium on Sunday.
Saints, who took the lead through Adam Lallana and made it 2-2 through Rickie Lambert, have now gone six matches with a win - hardly the best preparation for trips to Cardiff and Everton.
"It was very frustrating, we are very angry about the result," said manager Pochettino, who has been linked with the vacant Spurs post.
"We actually dressed up as Santa Claus today and gifted them so many goals and so many chances.
"We started off quite well in the first half, we got the 1-0 and we were very close to getting the 2-0 but then when we conceded the equaliser it was very hard to get back in the game, especially in the second half it was very tough.
"It was a frustrating day because at 1-0 we were in complete control. We only have ourselves to blame."