"In football you don't work long term, you go window to window and I can guarantee that Leighton will be here at the end of the season," said Martinez. "That is 100 per cent.
"That is how you work from window to window - to have a stronger squad than previously.
"Leighton is vital for us in the second half of the season. Bryan Oviedo has been terrific, but we need Leighton and Bryan fit for us, if we are going to fight for our football dream."
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