Celtic reject Porto's bid for Olivier Ntcham?

Porto have reportedly failed with a big-money offer for Celtic midfielder Olivier Ntcham.

Celtic signed Ntcham from Manchester City last summer, and the 22-year-old has gone on to establish himself as one of Brendan Rodgers's key men at the Glasgow giants.

However, the club's Champions League exit to AEK Athens will lead to a drop in revenue, and clubs could now potentially begin to target some of Celtic's most highly-regarded players.

According to Goal.com, Porto have decided to make a bid of £13m for Ntcham, only to see it rejected by the Scottish champions.

The report claims that Porto are likely to return with a new offer, while the Frenchman is said to hold an interest in making the switch to Portugal.

Ntcham still has three years remaining on his contract.