TalkSport reports that the Hammers are set to battle it out with Udinese and Lazio to sign the 22-year-old in January.
Boyd scored 17 goals for Austrian side Rapid Vienna last season.
The Germany-born striker joined Rapid Vienna from Bundesliga side Borussia Dortmund last year.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?