Lamps was expected to return to the side for tomorrow night's Carling Cup semi-final 2nd leg against Everton.
Chelsea lead 2-1 from the first leg and are desperate to retain the trophy they won against Arsenal last season at Wembley.
Frank junior's dad, Frank said two weeks ago that his boy might have played against Spurs in the Premier League.
But now Avram Grant, Chelsea's coach/manager has revealed that the England midfielder is struggling.
Grant said today: "All I can say about Frank's injury is he is not available at the moment. It is a little bit more complicated than we first thought but I think that he will be back soon, somewhere between days to two weeks."
Grant added that skipper John Terry: " Is not training but I think in two or three weeks, more or less, he will be available to play,"
Shaun Wright-Phillips might make a remarkable recovery from his turned ankle, which he received in Saturday's 1-0 up at Birmingham.
Grant said of SWP's chances: "Not all the players have been 100 per cent for the last games but the squad is very short and everybody, including Shaun, is doing everything to play. I don't know if he will play but it is good news that he is out there."
Well at least he knows SWP is short!
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