Ronald Koeman highlighted the importance of having most of this players available after Southampton defeated Crystal Palace 3-0 on Boxing Day.
The victory was Southampton's second on the spin in the league and means Koeman's side climb back into the top four.
It also continues Saints' resurgence after a difficult period saw the team lose five consecutive matches.
"We had some weeks where we didn't have all the players available and that is sometimes difficult because we don't have the quality in numbers," Koeman said.
"We had [Dusan] Tadic, [Victor] Wanyama and [Shane] Long on the bench and it means we can change it.
"It is important we show the spirit and belief we showed -- we need everybody." Koeman added: "We need all our players, you can't play with 11 players two games in 48 hours. You have to make some changes.
"We have those kind of players now that I can change the team. We kept the quality and the spirit, and it was a very solid win."
Information from Press Association was used in this report.