Lampard blames Chelsea sackings for trophy flop
Blues were defeated in the final of the Club World Cup on Sunday, having also lost the FA Community Shield and UEFA Super Cup, and having been knocked out of the Champions League.
Lampard said: "We worked very hard to get to the (Club World Cup) final.
"We changed the personnel quite a bit this year, and there's a bedding-in process. We changed the manager. There have been quite a few circumstances this year."