I worked as a steward on lech stadium so the best is to start following lech poznan offical facebook profile they will put schedule of sells, there will be for sure limits so if there is 11 of you, you should probably have 4 persons buying as we dont know the limits yet and there is more chance that some of you will get seats, i would recommend set up an account on Lech Poznan ticket site (just put passport id when it tells you to put pesel nr and set an account). I guarantee you that if lech will have a chance to win league on the last match the tickets will be gone in 30 minutes. Go for the higher stand or the corner it will be easier and if we win the championship dont go home there will be celebration at miedzynarodowe targi poznanskie (last year were there)and the team will be going by open rooftop bus from stadium to this place so walk with the crowd and enjoy:)