If the line up consist of those 3 and they are not under Complexity, LCS's official rule 3.2 (made to stop spot selling).

No team may have on their roster more than two players at a time from any single starting lineup of a different team that played in either region of the LCS and/or any aspect of the Challenger Series (including play-in) in the last two completed Splits. A Challenger Series team that wins its promotion match must play at least 3 members of the active roster that earned the spot in the LCS in the first game of the split.

They would be a team consisting of 3 member of the LCS lineup of 2014 summer split. Unless one of them leave the team after they get in, the rule can possibly prevent them from being in lcs?