The manager knows his side have to improve at the World Cup, despite Thursday's victory against Algeria in Lisbon
Portugal head coach Fernando Santos said the European champions have plenty of room for improvement heading into the World Cup following their 3-0 win over Algeria .
Cristiano Ronaldo returned as Portugal prepared for the Russia showpiece with a routine victory against Algeria thanks to Goncalo Guedes' brace Thursday.
Guedes produced an eye-catching performance with goals either side of half-time to give Portugal a boost ahead of their Group B opener against Spain in Sochi June 15.