The London Evening Standard says manager David Moyes and West Ham owner David Sullivan fought doggedly in what have been described as difficult negotiations with Manchester United chief executive Ed Woodward and their chief negotiator Matt Judge to secure a loan deal in January.
They agreed to pay a significant loan fee on top of covering Lingard's £100,000-a-week wages. The cost of the loan could rise above £4million by the end of the season.
That determination to sign him will not be lost on Lingard or those around him.
The England international has been given trust and a platform by West Ham and Moyes and he has rewarded them in magnificent style, leading their unlikely push for the Champions League.
For a player who believes strongly that a good environment is vital for producing strong performances, the move has proved a perfect fit.
Lingard has spoken about how living high in his apartment block in the capital has improved his mindset and helped his form, while he has struck up strong relationships with other players in the squad in a short period of time.
Mark Noble and Declan Rice have gone out of their way to help the new signing settle, and keeping Rice this summer could prove key in tempting Lingard on a more permanent basis. West Ham have continually stated that they have no intention to sell Rice, following reports that Manchester United would want to include him in a deal for Lingard.