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Chelsea were shocked 2-0 by Southampton at Stamford Bridge on Boxing Day.
The loss to Southampton means Chelsea slipped to consecutive home Premier League defeats for the first time in eight years.
Not since successive losses to Arsenal and Liverpool in October and November 2011 had Chelsea tasted back-to-back Premier League defeats at Stamford Bridge.
It was also the sixth loss the Blues have suffered in 15 Stamford Bridge matches in all competitions this term.
Asked if frustrating losses like the Saints defeat would nudge him closer towards the January transfer market, Chelsea boss Frank Lampard said: “I learn about the players, particularly in games like that I suppose.
“Games that turn out to be difficult are a test of character as much as they are quality. They are a test of both.
“When it’s all easy after Sunday’s 2-0 win at Tottenham, we were the greatest thing in the world, they were the greatest players and I was a great manager. And today it’s questioned.
“And it’s when you’re questioned that you’ll see the strength of character of someone I’d say.”