The Magpies are said to have been scouting Blues players over the past few months.
Per Chronicle Live, the Magpies had scouts watching their 4-3 win over Manchester United.
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Chelsea midfielder Conor Gallagher was the player they were focusing on the most.
Newcastle did sign Lewis Hall from Chelsea last summer in a loan deal that will be made permanent this summer.
Gallagher is not eager to leave Chelsea, but may be forced to go by the club to raise transfer funds.