The Telegraph says so. He told a Czech newspaper: "The train carrying the treaty is going so fast and it's so far that it can't be stopped or returned, no matter how much some of us would want that."
Earlier in the week it had appeared - according to The Times - that Klaus would NOT sign.
If the Czech Republic does ratify the pressure on David Cameron will be enormous. William Hague has promised to annouce what "we will not let matters rest there" on the day that Lisbon is ratified (if it is).