By Alex Taylor

Jonathan Calleri has signed for West Ham on a season long-loan but is not yet able to play for the club, according to a well-placed club insider.

Jack Sullivan, son of West Ham co-owner David Sullivan, claimed on his personal Twitter account on Tuesday afternoon that Calleri still needs international clearance before he can make his debut.

This comes after manager Slaven Bilic admitted he was closing in on the signing of Calleri but would not pursue Alexandre Lacazette’s signature this summer.

The Guardian have previously claimed that it will cost the Hammers a fee of £4million to secure the loan signing of Calleri from Uruguayan side Deportivo Maldonado.

Sullivan junior has become renowned for providing insider information on transfer deals on Twitter shortly before they are announced by the official West Ham media outlets.

The deal is the second loan move that the Hammers have paid a fee for in the current transfer window, having already secured Gokhan Tore from Besiktas for £2.5million.

The 22-year-old Argentine attacker was most recently at Sao Paulo, where he finished as top scorer in the 2016 Copa Libertadores with nine goals.

Calleri, who is yet to make any full Argentina appearances, has attracted Premier League interest since scoring 21 goals in 53 matches for former club Boca Juniors.

He has since been loaned to Sao Paulo for six months via Uruguayan club Deportivo Maldonado and 10 matches for the Brazilian side in 2016 yielded an impressive eight goals.

Bilic has been in the hunt for a proven goalscorer all summer, and has been linked with the likes of Carlos Bacca, Mario Gomes, Andre Ayew, Christian Benteke, Michy Batshuayi, , Theo Walcott as well as a sensational east London return for Carlos Tevez.

On Monday evening they announced the signing of Swansea striker Andre Ayew for £20.5million.

That breaks London club’s transfer record by £5million, as it usurps the £15.5million spent on signing Andy Carroll from Liverpool in 2013.

In other West Ham transfer news, Bilic has claimed that West Ham could only have beaten Chelsea to the signing of Michy Bathsuayi if they had bid for him earlier or offered more money than their London rivals.