The MLS roster freeze - the date on which 28-man squad lists for the rest of season must be submitted to the league - was September 15, so naturally the New York Red Bulls announced a new signing on September 16.
The new man is a familiar face: NYRB II's Aaron Long. The versatile defender (he can play, more or less, all four positions on the back line and as a holding midfielder) has already made two starts for the first team in CONCACAF Champions League, so he is no stranger to the MLS squad.