It's confirmed Benfica v Getafe is on thr 6th. I found this on TalkSoccer:
"you not going to believe this, Benfica had a chance to play at home on the 2nd leg and instead choose to play at home first"
And this is translated from http://www.ojogo.pt/
"Getafe plays in the Light in day 6 of March Guaranteed the presence in the eighth-of-end of Goblet the UEFA, responsible fleshes-color they had made right already the date of the game of the first hand front to the Getafe. The game with the Spanish formation was set appointments for day 6 of March, in the Stadium of the Light. The drawing of the UEFA dictated that the Getafe received fleshes-color in its enclosure first, but the controllers of the two emblems already had dialogued, waking up the change of the program."
There is no way Sporting and Benfica can play at home on the same day so get booking!!!