Southampton will not accept offers for forward Jay Rodriguez or midfielder Morgan Schneiderlin this summer.
Everton forward Kevin Mirallas has hinted that he will sign a new contract at Goodison Park in the summer.
The German-born Ghana international has been training with United since January.
The 20-year-old is understood to have impressed and talks are continuing over his future, as he has featured in recent games for United's Under-21 side.
Leicester could still recall Schlupp and use him, and manager Nigel Pearson says they will talk with United.
"I think we'll be discussing this week what the next step is," said Pearson.
"He's done well at United, he's played the last two games that he can play there so clearly it's going to have some effect this week."