Celtic midfielder Olivier Ntcham has reportedly emerged as a transfer target for Porto.
Ntcham left Manchester City to make the switch to the Glasgow giants last summer, and the 22-year-old has gone on to impress with 11 goals being scored from 53 appearances in all competitions.
The Frenchman still has three years on his contract at Celtic, but according to RMC Sport, Porto are weighing up an approach before the end of the month.
Celtic are unlikely to entertain any offers as they look to qualify for the group stages of the Champions League, but that could change should they fail to come through their final two qualifying ties.
Ntcham only cost £4.5m when arriving at Celtic, but Porto would likely to have to pay more than double that fee in order to be successful with a move before the end of August.