Johnny Sexton will make his return from a calf injury for Leinster in tomorrow night's Champions Cup Pool A clash with Gloucester at the RDS (live on RTÉ2 and RTÉ Player), however Tadhg Furlong once again misses out.The Ireland captain is named on the bench, having been sidelined for the last four games for club and country with a calf injuryLeo Cullen has made four changes to his side following last week's hammering of Racing 92, with Garry Ringrose once again captaining the side.There's just one change to the backline, with Luke McGrath rotated into the starting side at scrum-half and Jamison Gibson-Park dropping to the bench, as Ross Byrne continues at out-half.Ringrose and Charlie Ngatai pair off in the centre with Hugo Keenan at full-back, between wingers James Lowe and Jimmy O'Brien.There are three changes in the pack, with Rónan Kelleher brought in at hooker, swapping in for Dan Sheehan, while Andrew Porter and Michael Ala'alatoa continue at prop.Ross Molony comes into the second row for his 150th Leinster appearance, and packs down alongside James Ryan, with Jack Conan restored to the team in the back row.Elsewhere among the replacements, Jordan Larmour makes his return from a foot injury having been sidelined since early October.Leinster: Hugo Keenan; Jimmy O'Brien, Garry Ringrose (capt), Charlie Ngatai, James Lowe; Ross Byrne, Luke McGrath; Andrew Porter, Rónan Kelleher, Michael Ala'alatoa; Ross Molony, James Ryan; Caelan Doris, Josh van der Flier, Jack Conan.Replacements: Dan Sheehan, Ed Byrne, Cian Healy, Joe McCarthy, Max Deegan, Jamison Gibson-Park, Johnny Sexton, Jordan Larmour.Bundee Aki (above) is among eight changes for Connacht, ahead of their Challenge Cup meeting with Brive in France.Director of