We now turn our attention to the locks in our Five to Watch series, with a string of international stars featuring in next season’s Challenge Cup. For more information and how to buy tickets for the 2020 European Finals Weekend in Marseille, click HERE. Pool 1: Cory Hill (Dragons) The 27-year-old British and Irish Lion became a national hero overnight when he scored a try in Wales’ win over England last season, which helped them to the Six Nations Grand Slam. Hill was already a star for the Dragons, having crossed the whitewash four times in 23 Challenge Cup appearances for the Newport side – an impressive tally for a lock. He will be hoping to return from a stress fracture that has ruled him out of the World Cup. Pool 2: Romain Taofifénua (RC Toulon) Taofifénua has proven to be a key component in Toulon's powerful scrum in recent seasons, featuring 27 times in the Champions Cup since joining the French club in 2014. In his maiden campaign with Toulon, he helped them lift a third successive European Cup and will surely have a huge impact as he returns to the Challenge Cup for the first time since playing for Perpignan in 2013. Pool 3: Ben Toolis (Edinburgh Rugby) This choice was a toss-up between Toolis and his Edinburgh team-mate, Grant Gilchrist, but Toolis wins the day as he topped last season’s Heineken Champions Cup line-out list with 35 successes in seven matches, including five steals. The Brisbane-born 27-year-old, who is eligible to represent Scotland through his mother, has also caught the eye of national head coach Gregor Townsend, having won over 20 caps. [jwplayer up8eyOUH] Pool 4: Dave Attwood (Bristol Bears) Attwood has returned to Bristol after two seasons with Gloucester Rugby and six with Bath Rugby, bringing with him a vast well of experience and scrummaging knowhow. The towering 32-year-old won 24 England caps between 2010 and 2018, and has 49 European appearances to his credit, including six for Bristol in his first spell with them between 2007 and 2009. Pool 5: Tomas Lavanini (Leicester Tigers) Leicester are banking on Lavanini giving their line-out and scrum a big boost in their first season in the Challenge Cup, after signing the giant Argentina lock from Jaguares. The 26-year-old, who has been capped over 50 times, has played in the Champions Cup before in his single season with Racing 92 in 2014-15, albeit only once.