Former Everton striker Yakubu is training with League One strugglers Coventry.
The 34-year-old Nigerian is a free agent after leaving Turkish club Kayserispor.
Sky Blues manager Russell Slade told the Coventry Observer: "He's in, he has had his first training day with us this morning.
"He's played in the UK and his scoring records are very good.
"He is 34 now, his last club was in Turkey. He hasn't played for a while which is the only concern, but he has great pedigree. Goals wise, it is one in two.
"If that is the sort of thing he can do for us then we've got to be interested."