The European Union's chief Brexit negotiator said on Wednesday the bloc would remain "calm, vigilant, respectful and constructive" ahead of crucial Brexit negotiations on Thursday. Michel Barnier also said a deal was "very difficult, but possible." Barnier will be meeting with UK Brexit envoy Stephen Barclay on Thursday as both sides are saying that the chances of reaching a divorce deal look increasingly slim. EU and UK negotiators have been meeting at technical level this week and Barclay's visit comes in the wake of a series of acrimonious comments from both sides on the state of relations. The EU has said that Prime Minister Boris Johnson needs to have workable proposals by the end of the week if there is to be any chance of a breakthrough at the October 17-18 EU summit.