How would we use him? If it's as a cover for Maddison, we might as well use Lo Celso for that. As a winger maybe? I'm not sure that's the best use of him.
Lo Celso has 2 years left on contract and has been hugely disappointing in the first 3 years - has only completed 90 mins in 7 PL matches since arrival due to a combination of injuries and a desire to play for Argentina at every turn, even when not fit enough to play for Spurs.
So I'm not sure club will be keen to renew his contract at his current high salary. Players with contracts needing to be renewed often play better, but after contract signing players can get very uninterested - will that happen ?
Not sure what price Eze might be, but I'd suspect he's be seen as an upgrade on Lo Celso, and if we sold Lo Celso it would resolve Lo Celso's contract situation plus give the club another quality HG player that we need.