**Three teams remain unbeaten in this season’s Guinness PRO14 as we head into Round 7.** \n\nWe are set for another weekend of thrills, spills and high-octane action with four contests on Sunday and one on Monday night. \n\nTriple-defending champions Leinster host **Cardiff Blues** looking to equal a Championship record seven consecutive bonus-point victories but it is the visitors who go into the contest [bearing good news](https://www.bbc.co.uk/sport/rugby-union/55008417). \n\nWales scrum-half Tomos Williams will return from shoulder surgery for the Blues to face the Conference A leaders, having been on the sidelines since suffering the injury against Scarlets in August. \n\nHead coach John Mulvihill said: “Tomos is available and will be back. He's got a good rugby brain and game instinct so we're looking forward to seeing that come out on the weekend.”\n\n**Leinster** boss Leo Cullen though has [warned his side against complacency](https://www.the42.ie/leinster-concern-pro14-cullen-5271141-Nov2020/) after their run of six straight five-point victories. \n\nHe said: “It’s important for us to be very open about that in terms of looking to improve all the time.