Jose Mourinho admitted earlier this week that he had a 'plan B and C' in case his efforts to sign Wayne Rooney remained unsuccessful, but the specifics remain a source of speculation.
Samuel Eto'o has been discussed as one option, a costly one from a wage perspective as he is the highest paid player in the world presently.
A third could be Porto striker Jackson Martinez, who The Express claim is on their radar.
The paper, citing ESPN as their source state that: 'Mourinho has become an admirer of Martinez as he feels he could fit into Chelsea's system.'
They are quite right, Porto's formation from the 2012/13 season illustrates that Martinez was played as a lone striker, with tricky creative players like James Rodriguez and Silvestre Varela supplying the passes.
With Hazard, Mata, and Oscar at Chelsea, Martinez would quite rightly be fancied to come up with the goods. But how could that even happen?
From Chelsea's point of view, it is amazingly simple. In a transfer window of 'will he, won't he', Martinez has been described as the wildcard. If they want him, they go and get him.
Martinez has a release clause in his contract of €40 million, or £34.8 million in sterling. Porto are powerless to reject such an offer, and it's probably one they will pragmatically accept as a good opportunity.
The striker signed for €8 million last summer from the Mexican league, a gamble on their part, one that Liverpool are still regretting passing up after being strongly linked with him and in touch with his agent.
That is where any reluctance this summer comes in, clubs are wary of Martinez being a highly expensive one-season wonder.
But wow, what a season. He broke a record set by fellow Colombian, Falcao - an earlier season target for Chelsea, netting 11 times in 12 games at the start of the season.
Martinez would go onto score 31 goals over the course of the season, leading Porto to the Primeira Liga crown. If he left now, there could be no arguing his only season there was successful.
Porto of course are Jose Mourinho's old club, and he will not have any worry about the strength of the league, knowing it well and what sort of players are successful of making the jump up.
Chelsea remain for now, firmly aimed on Wayne Rooney, but if Manchester United continue to hold firm, Jackson Martinez at 26 may find himself getting a call - a far more longer-term prospect than Samuel Eto'o, six years his senior.
Chelsea fans, will you settle for Martinez? Is he worth the money?
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