Having been trounced by Mercedes in Australia, team boss Stefano Domenicali concedes there is still a lot of work for Ferrari to do.
While Mercedes dominated Down Under, Ferrari lacked the pace in both qualifying and the grand prix to challenge for the lead.
Alonso could only manage fifth in qualifying before going onto finish in fourth place, although that one position he made up was due to Daniel Ricciardo being disqualified.
His team-mate Kimi Raikkonen finished seventh in the final classification by was almost a full minute down the road from race winner Nico Rosberg.