Jackson Martinez signals possible transfer to Manchester United, Arsenal, Liverpool or Tottenham
Colombia international admits he expects to move during the summer

Jackson Martinez has provided hope to a host of Premier League teams linked with his signature after indicating he will look to complete a transfer in the summer.
The Porto striker has been linked with Manchester United, Arsenal, Liverpool and Tottenham recently but no move during the most recent window materialised.
However, once it re-opens again in the summer it seems Martinez could be on his way.
"Right now I only focus on doing my job with Porto, but I'm ready to make the leap in the next window," said the Colombia international.
"I have my head focused only on the work I'm doing at Porto at the moment and when the transfer window re-opens, we shall see what will happen."
Martinez has followed on from an impressive World Cup, where he scored two goals, with a rewarding season in Portugal. The 28-year-old has notched 20 goals in 24 appearances this term, including five in the Champions League.
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