According to reports from the Daily Record, Jack Hendry could still leave Celtic before next week.
Clubs in Portugual are keen to secure the services of the 24-year-old who has dropped down the pecking order at the club under Neil Lennon.
Hendry joined the Hoops during the January transfer window of 2018. Brendan Rodgers, then Celtic manager, praised Hendry at the time of signing, saying the centre-back has all the potential to be a top-class defender.
Rodgers said to BBC Sport: “When you come to Celtic you have to deal with expectation and pressure.