Celtic midfielder Olivier Ntcham could be on his way out of the club as Porto are ready to make a bid which will include Chancel Mbemba going the other way, claims The Scottish Sun.
The Portuguese side are reportedly prepared to pay up to £14 million for the France Under-21 international, who arrived in Glasgow from Manchester City last summer.
Ntcham has made 30 appearances in all competitions for Celtic this season, scoring six goals and registering one assist.
His form has alerted Porto and The Scottish Sun claims the club is desperate to sign him and even tried to force a move at the start of the season but failed.
Even though Ntcham has a contract with the Hoops until the end of 2022, Celtic could choose to cash in on what is an attractive offer.
A deal to sell the midfielder would represent a significant profit for the Bhoys, who paid £4.5 million for the Frenchman in July 2017.
DR Congo international Mbemba moved to Porto from Newcastle United in the summer but has made just five appearances this season.
The 24-year-old centre-back is also capable of playing as a defensive midfielder and his arrival would go some way to assuaging the loss of Ntcham in the middle of the park.
The report claims Celtic boss Brendan Rodgers has previously expressed interest in signing Mbemba.
He is now out of favour at Porto with manager Sergio Conceicao preferring other options at the back, so a cash-plus-players deal might see both clubs and managers satisfied with their business.
Celtic have already loaned in Oliver Burke and Timothy Weah as well as signing Issouf Bayo and the paper reports they will soon add American defender Tim Gutman to their list of January arrivals.