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The goal conceded against West Ham means Tottenham has now conceded 22 goals in 13 games. That is not good enough for a top-four side.
The defense as a whole looked very solid throughout the game and should really have kept a clean sheet.
Hugo Lloris seems to have cemented the starting goalkeeper position in recent games and wasn't wholly at fault for the West Ham goal.
He made some important saves throughout the game, most notably on Kevin Nolan's low cross which would have found an open Matt Jarvis.
Michael Dawson and Steven Caulker had a solid partnership that, while it should still not be the first-choice central partnership, showed that William Gallas should no longer be first choice for Andre Villas-Boas.
Things should get better when Benoit Assou-Ekotto returns from injury thus allowing Jan Vertonghen to move back to his preferred position and give the Portuguese manager even more options in central defense.
Villas-Boas will need to sort out his best selection for the back four and ensure they are well-marshaled if he really wants success as the season progresses.