The 19-year-old has made the switch on a season-long loan and will join Tino Livramento and Dynel Simeu at St. Mary’s.
Chelsea are also willing to listen to offers for 12 players this summer as the Blues look to have a clear out in their squad, according to reports.
Broja impressed during pre-season, scoring against Peterborough United and Bournemouth and has now earned a loan move to a Premier League side.
Following his loan switch, Broja told the official Southampton website: “I feel very happy. I was really excited to join Southampton. It’s obviously a very good Premier League club.
“They’ve got a good history and they play in the best league in the world, so it’s amazing for a young player to experience it, be in and around a Premier League team, and learn and develop from the older players, the staff and everyone here. It’s a very good opportunity.”
Manager Ralph Hasenhüttl hailed the Albanian’s talent. He added: “Armando is a very talented player who we were impressed by last season.
“He is young, but he comes now with a full season of experience in senior football with a good team, and he brings a lot of qualities that can help us.
“He is a strong, quick player with a good instinct and this makes him a good fit for the way we like to play.
“I know how highly regarded he is by Chelsea, and I think this will be a good place for him to continue his own development as well.”
The news comes as Chelsea look to bring in Romelu Lukaku and Jules Kounde this window.
According to the Telegraph, Chelsea could offload 12 first team players over the final month of the transfer window.
Kurt Zouma, Tammy Abraham, Callum Hudson-Odoi, Ruben Loftus-Cheek, Ross Barkley, Davide Zappacosta, Michy Batshuayi, Kenedy, Danny Drinkwater, Baba Rahman and Marcos Alonso are all being considered for sale or loan moves this summer as Thomas Tuchel looks to trim his squad.
Zouma has been linked with a move to Sevilla in a deal to bring in Kounde, whilst it is believed he would prefer to stay in London amid West Ham’s interest.
The arrival of Lukaku will see Abraham surplus to requirements as the striker gains interest from the Premier League and abraod.
The other players on the list do not have as many suitors, therefore loan moves could be on the cards for the Chelsea outcasts.
What has Thomas Tuchel previously said about his squad?
Speaking after Chelsea’s pre-season match against Bournemouth, Tuchel said: “There is now a training group of 28 or 29 in training which is huge. We have more coming back in the near future so we have to make decisions and it’s good to learn during matches because we need to judge them on a fair basis and impressions on games, this is better than in training.”