Chelsea see Benfica midfielder Julian Weigl as a knockdown alternative to West Ham's Declan Rice.
O Jogo reports the Hammers will want at least £68.8million (€80m) for Rice.
Chelsea boss Thomas Tuchel is therefore keeping an eye on Weigl, who would be considerably cheaper.
Chelsea could sign the 25-year-old for as little as £25.8m (€30m).
Weigl came through the academy at 1860 Munich before moving to Dortmund in 2015 - the same summer Tuchel became the Bundesliga club's manager.
He was a regular presence under Tuchel, making 94 appearances in two seasons before the German was sacked in 2017.
Weigl fell out of favour in his last couple of seasons at Dortmund and moved to Benfica in January 2020.
