Swansea City defender Steven Caulker could be out for up to eight weeks after suffering a knee injury.
The 19-year-old damaged his cartilage after he clashed heavily with an upright whilst making a goal line clearance.
However captain Garry Monk is set to return for Saturday's home game against West Brom.
Monk has not figured for Brendan Rodgers' side this season but has played two reserve team games and could be a direct replacement for Caulker.
Caulker joined Swansea on a season long loan in July and has featured in their four matches so far in the Premier League.
But the defender will return to parent club Tottenham to have his knee injury assessed by the club's medical staff.
Midfielder Agustien for up to six weeks because of a hamstring injury he suffered at Arsenal last weekend.
Striker Beattie, who has yet to play this season, will be absent for eight weeks due to ankle ligament damage.
And Tate is out for up to six months after breaking his left leg in a bizarre golfing accident.