Costa can become the new Drogba for Chelsea' - Cahill

The Spain international scored 20 goals in his debut campaign in west London and the defender feels he has what it takes to emulate the departing Ivorian.Chelsea defender Gary Cahill has backed Diego Costa to become the next Didier Drogba at Stamford Bridge after the Ivorian announced his departure from the club.Drogba's second spell in west London ended on Sunday as the Blues celebrated their Premier League title win with victory over Sunderland.Costa netted his 20th Premier League goal of the season in the 3-1 win over the Black Cats, and Cahill feels the Spain international has what it takes become as big a hero with the club's fans as Drogba.I know it's the second time Didier's been here but obviously it's sad that he's played his last game for the club, he told the club's official website.
He said a few words before we left the hotel, it was only brief but it was good.I'm sure one day we'll see him back at the club. I don't think he's gone forever but probably from a playing point of view that was his last game.They're big shoes to fill but Diego couldn't have started his Chelsea career any better.He's had a couple of injuries but nevertheless his goalscoring ratio has been phenomenal.He'll be a big player here and with Diego in the team you're a far better side.Cahill also admitted that Blues boss Jose Mourinho has made it clear how difficult it will be to defend the crown that Chelsea won so impressively this term.He's told us it will be a lot harder to win it next season, he's drilling that into us and as players that's a good thing, Cahill added.It's important for us to take his advice as someone who's been there and done it and no doubt it will be tough because teams always want to beat you when you're champions, like Man City have found this season.You don't need to be told it's hard. I know how hard it's been this season, even though we've been at the top all the way through.I'm sure other teams will strengthen in the summer and that will make it even harder for us.