Di Santo joined Rovers on a six-month loan deal over the summer and on Saturday helped his new side secure a victory over Aston Villa when winning a late penalty in his first game following his return from a hamstring injury.
Rovers had harboured hopes of retaining the services of Di Santo but with Chelsea prevented from signing any new players in the next two transfer windows following the Gael Kakuta controversy, and Didier Drogba and Salomon Kalou both expected to travel to the African Cup of Nations, Di Santo could well return to Stamford Bridge.
Under the conditions of their FIFA punishment, Chelsea are prevented from recalling players from loan spells so Michael Mancienne and Scott Sinclair will spend the season at Wolves and Wigan respectively. But Di Santo's loan contract will expire and Allardyce is not hopeful of negotiating a longer stay for the Argentine forward.
"Chelsea needed him to play in the Premier League," Allardyce told the Lancashire Evening Telegraph. "He could have gone elsewhere in Europe but it is in the Premier League where they need to find out if he is good enough for them and there is no doubt if we continue with him and develop him and he continues to play the way he did today it would be great for us up to January.
"Then perhaps Chelsea will benefit from there on if the ban stays and with African Nations players going away. We knew we would probably lose him in January but that is the process. We lost Roque and we knew Chelsea were trying to get him Premier League experience."
Meanwhile, Rovers have confirmed that England Under-21 international Frank Fielding has joined Leeds United on a one-month emergency loan deal. Fielding makes the trip to Elland Road following an injury to Shane Higgs and will go straight into the squad for Tuesday's game against Carlisle United.