Delph has played, what, a quarter of the matches during his time at EFC. And that's four years. If he was available even half the time I would consider an extension. But he simply isn't.
Mina is another. Also would be a great help if he was actually available. But we can't trust he is.
Allan should be relatively easy to sell. Still good reputation in Italy. Gomes also a possibility. He could thrive in a slower league.
Either DCL or Richarlison will leave, possibly both. We need to generate funds.
I also do think Keane is for sale if there are buyers.
Doucoure is another. He just doesn't look the correct type for Lampard. He might also still generate some funds. We'd make a loss but should be able to recoup a decent sum. Same goes for Gray. Good thing he was so cheap so we might actually make a profit.
But it's clear midfield needs an overhaul.