2. Javier Hernandez – Bayer Leverkusen – Many may perhaps rightly argue that Hernandez would not be an improvement to Costa. However, while this may, to some extent, be true, the Mexican is the out-and-out striker that Chelsea need. Hernandezs game is fixated on goals and his movement makes him a nightmare for defenders. These are both areas that Costa is not impressing in at present. Hernandez has exceeded expectations in the Bundesliga this season, having scored 10 goals, and could relish the opportunity to prove former club Manchester United wrong in their decision to sell. Whats more, the forward isnt likely to command a significant price tag and could be the cheaper option in the winter window. 6 1. Gonzalo Higuain – Napoli – The Argentine was tipped to leave Stadio San Paolo in the summer transfer window, and despite staying put, he continues to be linked with an exit. Over the past few days, reports have suggested that Higuain is Chelsea’s top target to replace Diego Costa. And while the player’s agent and brother has insisted that the forward is happy in Italy, a move to Stamford Bridge should not be ruled out. Mourinho worked with Higuain at Real Madrid, which could give the Blues the upper edge in possible negotiations. 6 6 6 6 3. Antoine Griezmann – Atletico Madrid – Chelsea were heavily linked with Griezmann, who scored 22 goals in his first season at the Estadio Vicente Calderon, at the end of their title-winning campaign. Unsurprisingly, the La Liga outfit refused to cash in, but with the 24-year-old continuing to find the back of the net, the Blues interest could still remain intact. The major issue in signing Griezmann, however, could be Atletis asking price. The Frenchman is said to have a release clause of around £43m, and prising him away mid-way through the season could see his price tag soar. Griezmann may be a target that Mourinho will have to wait until the summer to attempt to sign. 4. Paco Alcacer – Valencia – Before putting pen to paper on a new five-year contract with Valencia in January, the Spaniard was heavily linked with a move to the Premier League. Chelsea, nonetheless, have continued to monitor his progress, and having scored five goals in La Liga thus far, he has impressed. However, with a long-term contract having been signed less than a year ago, the striker wont come cheap. 6 5. Alexandre Lacazette – Olympique Lyonnais – Lacazette was one of the most highly sought after strikers at the end of last season, but opted to commit his future to Lyon, signing a new contract with the club until 2019. The 24-year-old hasnt quite hit the ground running this term, with five goals in 11 appearances, but he remains one of the most exciting attacking prospects in Europe. If the Blues are willing to take a gamble on the centre forward, the right price could tempt the Ligue 1 outfit into selling. With more yellow cards than goals this season, Diego Costa has become a major concern for Chelsea. The Spain international, when fit, has been one of the few players that Jose Mourinho has remained loyal to, but the Portuguese manager could now be contemplating a change in his attack.Costa again failed to find the back of the net in the Blues’ defeat to Stoke City at the weekend, with the striker more interested in upsetting his opponents that doing his job in the final third.And with the January transfer window closing in, Mourinho may urge Roman Abramovich to spend big – and a new centre forward could be his top priority.In light of this, therefore, we’ve taken a look at six strikers Chelsea could target in less than two months’ time, including an ex-Manchester United player.Find out our pick by clicking the yellow arrow above, right. 6. Patrick Bamford – on loan from Chelsea at Crystal Palace – As with any young player with limited experience, throwing them into the first-team, particularly during such a problematic period, is a risk. While Bamford has failed to catch the eye of Alan Pardew at Selhurst Park, would he be any more of a gamble than Radamel Falcao? The England Under-21 international looks unlikely to be handed much action with the Eagles, and could be open to returning to Stamford Bridge in January. Its improbable that he will solve the Blues attacking crisis, but there would be few more players in the squad eager to impress and this is exactly what Chelsea need at present: hunger. Not only this, but Roman Abramovich wouldnt have to negotiate a sizeable transfer fee and fans are desperate to see talent from their youth setup be given their chance to shine.