Boyd could make his return to the Kilmarnock side in tomorrow's Clydesdale Bank Premier League clash with Hibernian after re-signing for the Ayrshire club on Saturday.
The 29-year-old has not played since September, when he made his last appearance for Portland Timbers in the MLS.
Boyd previously had an unhappy spell in Turkey with Eskisehirspor, walking out on the club over their failure to pay his wages.
The former Rangers striker, who scored 12 goals for Middlesbrough and Nottingham Forest in his one season in England, was eager to be closer to his family and jumped at the chance to sign for the club where he scored 67 goals in his formative years.
Boyd, who is the SPL's all-time top scorer with 164 goals, said: "I feel as if, apart from maybe the first four or five months that I had in America, it's been two years probably wasted in terms of football.
"I felt as if I need to go back to basics and start again. Kilmarnock gave me the opportunity to do that and it's a great opportunity to take a step back and appreciate what you've got and get your head down, work hard and get games.
"I need to work hard in training to get myself in the team and hopefully between now and the end of the season I can do that and start scoring."