Defender Collins is set to see his West Ham contract expire.
Celtic defender Kieran Tierney has been linked with moves away in the summer transfer window.
Ibrox club Glasgow Rangers manager Steven Gerrard reportedly wants to sign Jermain Defoe, but former Celtic striker John Hartson does not see the Bournemouth star at the Gers.
Premier League trio Manchester United, Tottenham and Bournemouth want Kieran Tierney from Scottish Premiership champions Celtic.
Graeme Murty has performed admirably in his role as Glasgow Rangers manager at Ibrox this season.
French striker Edouard was excellent in Celtic's 5-0 win over Rangers on Sunday.
Celtic have won the last six Scottish Premiership titles, and will make it seven with a victory on Sunday.
Scott Brown has been at Scottish giants Celtic for 11 years.
Brendan Rodgers' Celtic side play host to Graeme Murty's Rangers at Parkhead on Sunday.
Brendan Rodgers' Celtic side were far too good for Graeme Murty's Rangers in the Scottish Cup on Sunday.