Argentine-born Italian striker Osvaldo, signed for a fee reported to be £14.6 million last year, had an undistinguished spell on the south coast and was sent out on loan to Juventus for the second half of last season.
The 28-year-old scored three goals in 13 appearances and was involved in a training ground fight whilst at Southampton.
The arrival of 22-year-old Taider, part of the impressive Algeria squad at the World Cup, provides some cheer for the fans who have seen the team which finished eighth last season break up.
"It's part of our philosophy for the club to bring in talented young players who like to learn and develop themselves, and that's true of Saphir," Koeman told the club's website.
"First of all, he is a talented football player. He's 22 and has already played for Algeria at the World Cup.
"He can play as a controlled midfielder, but he can also move up around the box and up front, which is a good thing for a coach or manager because it brings more possibilities to the players in the team. He brings competition to the squad."
Both clubs can exercise options to make the loan deals permanent at the end of the season.
It is no surprise that Osvaldo has walked as he is a troublemaker of epic proportions; the signing of Taider is a good one though as he is an excellent player, versatile and skilful with strength to match.
Saints were seen as dead ducks due to the exits, but they are signing well and could well be in the hunt for a European place again. Certainly not relegation fodder...
- Sports & Recreation
- Adam Lallana
- Rickie Lambert
- Mauricio Pochettino
- Dejan Lovren
- Tottenham Hotspur