(Adds futures, further company news) LONDON, May 28 (Reuters) - European shares were indicated to edge lower at the open on Thursday, giving back some of the late gains made the previous day as euphoria about a possible deal between Greece and its creditors faded. futures on the Euro STOXX 50, Germany's DAX, France's CAC and Britain's FTSE equity indexes down between 0.1 percent and 0.3 percent at 0630 GMT. European shares had rallied late on Wednesday on reports of staff-level a