Martins has flown back to his native Nigeria to be at the funeral this weekend and the striker is distraught as he struggles to come to terms with the loss of his mother, Alhaja.
The 62-year-old was a regular visitor to England, where she would stay with her son in his Newcastle apartment and Martins has understandably taken the news badly.
Chris Nathaniel (Martins agent): "As you would expect, Oba is extremely upset at the moment.
"This has come as a massive shock to him and his family. His mother was a guiding light to him and had a strong influence on his life.
"At this difficult time for Oba and the family, it is important they are allowed to mourn their loss in private, and I hope the media allows them to do this."
NUFC spokesman: "Oba has flown back to Nigeria on compassionate grounds to be with his family at what is a very sad time for them. Everyone at the club extends their greatest sympathies to Oba and his relatives."