According to Yahoo! Brasil, Calleri's father Guillermo has claimed that Tottenham have a verbal agreement with the striker's club to sign him when this season's Copa Libertadores is over.
The London Evening Standard has reported that West Ham United are considering making a loan move for the young Argentine striker.
Calleri is owned by Uruguayan club Deportivo Maldonado, who signed him from Boca Juniors and then loaned him out to Sao Paolo in January.
Vickery, who is well-known expert on South American football, has taken to Twitter to share his opinion on Calleri’s talent and potential.
Calleri - last I heard was trying to get an EU passport. Don't know if that has come through yet. What is my view of him? To be honest...— Tim Vickery (@Tim_Vickery) May 23, 2016
... undecided. He's got more than Mauro Boselli but I can't see him as much more than an honest trier at the top level— Tim Vickery (@Tim_Vickery) May 23, 2016