​David Silva has joined Manchester City team-mate Sergio Aguero as a doubt for October's derby at Old Trafford, report the ​M.E.N.





Silva departed just seven minutes into Spain's Euro 2016 qualifier with Luxembourg on Friday, following a tackle from behind by Lars Gerson.





Spain coach Vicente del Bosque told reporters afterwards: "I do not know the extent of the injuries.





"Our doctors will inform you when they know something. We know nothing for now."





Spain later confirmed Silva suffered "a bad sprain of the internal lateral ligament of the right ankle," while AS report the playmaker faces "two to three weeks out".





City, who lead Arsenal and neighbours Manchester United by two points at the top of the Premier League, face five games in 15 days following the climax of the current international break.





Bournemouth travel to the Etihad Stadium next Saturday, with Sevilla the visitors in the Champions League on Wednesday 21 October.





But it's Silva's availability for the following Sunday's Manchester derby that is City's primary concern, especially after top scorer Aguero appeared to be ruled out for the fixture.





"I think I'm going to be out for a month," the Argentine told the media after being stretchered off in Argentina's 2-0 defeat to Ecuador on Thursday.





Sergio Aguero Suffers Hamstring Blow While Playing for Argentina http://t.co/VfCHGdfYwi — 90min (@90min_Football) October 9, 2015





The Argentine FA later confirmed: "The studies we did today show that Sergio Aguero has a grade-two muscle tear."