I don't know if Mason Mount will consider signing a new contract now that the team is being managed by his mentor(Frank Lampard). 300k dollars wouldn't be too big for the club. Mount is a productive player in Chelsea. He was of beneficial importance under Tuchel's management, I quest his decline in performance started when Potter took over the club, Potter's habit of placing players wrongly contributed to the poor performance of many players in Chelsea, not only mason mount. Even at Mount's current condition, I prefer him to Havert if It were to be an option.
It's not about "300k was not big for the club", it's caused by the management shall adjust the new contract based on how good or bad the performance of the player. Liverpool, if it has no chance anymore to get jude bellingham from dortmund and liverpool, changes its target to the mason mount. It's not clear whether mount already extending his contract with chelsea or not but some news said that liverpool was even closer to mason mount.
the Reds have stepped up their interest in Mount even further and he is now the club's priority to begin their revamp of their struggling midfield. The 24-year-old has just over 12 months remaining on his contract at Stamford Bridge and the two parties are no closer to reaching an agreement over an extension.
https://www.football.london/chelsea-fc/transfer-news/liverpool-chelsea-mason-mount-transfer-26677309Mount doesn't wanna a longterm contract with chelsea. that's why he has rejected the latest offer from the club. The future of mason mount is still uncertain at this moment.
There are so many speculations related to his future but mount itself has not yet determined what's gonna be his choice. Chelsea faces a horrible situation right now. I think that mount may be leaving from the club in summer.