In the draws for each round, teams are seeded based on their UEFA club coefficients at the beginning of the season, with the teams divided into seeded and unseeded pots containing the same number of teams. A seeded team is drawn against an unseeded team, with the order of legs (or the administrative "home" team in the preliminary round matches) in each tie decided by draw. As the identity of the winners of the previous round is not known at the time of the draws, the seeding is carried out under the assumption that the team with the higher coefficient of an undecided tie advances to this round, which means if the team with the lower coefficient is to advance, it simply takes the seeding of its opponent. Prior to the draws, UEFA may form "groups" in accordance with the principles set by the Club Competitions Committee, but they are purely for convenience of the draw and do not resemble any real groupings in the sense of the competition. Teams from associations with political conflicts as decided by UEFA may not be drawn into the same tie. After the draws, the order of legs of a tie may be reversed by UEFA due to scheduling or venue conflicts.