Italy coach Antonio Conte has called up AC Milan attacking midfielder Giacomo Bonaventura as the 2012 finalists look to take another step towards qualification for the 2016 European Championships against Croatia on Friday.

Bonaventura had originally been left on the sidelines for Friday's clash in Split but joins the squad two days after striker Simone Zaza and defender Andrea Barzagli were sent home due to lack of fitness.

Zaza had already complained of a sore back prior to travelling to Italy's training camp at Coverciano, and Barzagli, who only returned to training last week after suffering an injury knock, has not fully recovered from playing a full 90 minutes in the Champions League final against Barcelona last Saturday.

Barzagli had already been replaced by Sassuolo defender Francesco Acerbi while Bonaventura's versatility up front gives Conte options against a side which held the Italians to a 1-1 draw at the San Siro last November.

"We're working hard so we can produce a solid performance," said Conte.

"They (Croatia) are a very strong side and showed that against us at the San Siro but we're fully focused on sealing our place in the championships."

Italy, second in Group H two points behind Croatia, face Niko Kovac's side at the Poljud stadium looking for their fourth win in five qualifying matches.

A win for Croatia would see them pull five points ahead of Italy and leave Conte's men in danger of being overtaken by Norway, who are only two points adrift ahead of their home game against Azerbaijan.

Conte, who led Juventus to three consecutive league titles before quitting to take charge of Italy, admitted he is considering other options to his trademark 3-5-2 formation.

"I have to find the best system to suit the players I have. The 3-5-2 is a good formation but we need to have alternatives for the future," he added.

Conte on Monday praised the achievements of his successor at Juventus, Massimiliano Allegri -- who led Juve to the Champions League final, and a 3-1 defeat to Barcelona.

But he launched a plea to ageing midfield maestro Andrea Pirlo, who some reports have linked with a move to a team in the Major Soccer League (MLS).

"I'm really happy Andrea still wants to continue," said Conte.

"He hasn't told me anything, but knowing him I'm sure he is still as passionate and enthusiastic for the national side.

"I don't believe he is thinking about international retirement, or of leaving Italy."

Italy, who lost the Euro 2012 final to Spain, will follow Friday's qualifier with a friendly against Portugal in Geneva on Tuesday.

Revised Italy squad for Euro 2016 qualifier against Croatia:

Goalkeepers: Gianluigi Buffon (Juventus), Daniele Padelli (Torino), Salvatore Sirigu (Paris Saint Germain/FRA)

Defenders: Francesco Acerbi (Sassuolo) Davide Astori (Roma), Leonardo Bonucci (Juventus), Matteo Darmian (Torino), Mattia De Sciglio (AC Milan), Lorenzo De Silvestri (Sampdoria), Emiliano Moretti (Torino), Manuel Pasqual (Fiorentina), Andrea Ranocchia (Inter)

Midfielders: Andrea Bertolacci (Genoa), Giacomo Bonaventura (AC Milan), Daniele De Rossi (Roma), Claudio Marchisio (Juventus), Marco Parolo (Lazio), Andrea Pirlo (Juventus), Roberto Soriano (Sampdoria), Marco Verratti (Paris Saint Germain/FRA)

Strikers: Antonio Candreva (Lazio), Stephan El Shaarawy (AC Milan), Manolo Gabbiadini (Napoli), Ciro Immobile (Borussia Dortmund/GER), Alessandro Matri (Juventus), Graziano Pelle (Southampton/ENG), Nicola Sansone (Sassuolo), Franco Vazquez (Palermo)