Celtic have agreed a £2.8million deal with Motherwell for midfielder David Turnbull.

And the Parkhead club are also investigating a move for £7m-rated Toulouse central defender Christopher Julien.

Sportsmail first revealed the Parkhead club's interest in 19-year-old Turnbull two weeks ago.

Celtic have agreed a £2.8million fee with Motherwell for teenage midfielder David Turnbull

And the Fir Park club have now confirmed they had accepted an offer for the Scottish Football Writers' young Scottish player of the year after rejecting an opening gambit last week.

Scotland Under-21 international Turnbull scored 16 goals in 34 appearances for the Lanarkshire side in his breakthrough season.

And the Celtic deal will shatter Motherwell's previous record fee of £1.75m for the late Phil O'Donnell in 1994.

The subject of a rival bid from Barnsley, a Motherwell statement confirmed they had granted Celtic permission to discuss terms with the teenager's agent.

Turnbull was named the Scottish Football Writers' young Scottish player of the year in May

'Should the deal go through, the value of the transfer will vastly exceed our previous record fee received,' read the statement.

'We have rejected several seven-figure offers for David in recent weeks, with clubs the length and breadth of the UK speaking to us about him. It is clear from that the fee we stand to receive fully maximises his potential value.

'We have continued to stand by what we believe is a fair value for David. In light of the negotiating stance we have adopted, the money we stand to receive will be transformational for us as we continue to operate as a fan-owned club.'

Celtic are also considering paying around £7m for Toulouse defender Christopher Julien

Neil Lennon's first signing since returning as manager, Turnbull's arrival will end Celtic's interest in West Bromwich Albion free agent midfielder Rekheem Harper.

However, the Parkhead club are also considering whether to meet a fee in excess of £7m for 26-year-old Toulouse centre-half Julien.

Reports in L'Equipe that Julien recently paid a flying visit to Glasgow to look around Parkhead and Lennoxtown have been denied by Celtic sources.

In the market for central defenders after the departures of Dedryck Boyata and Filip Benkovic, however, the Scottish champions are assessing whether they want to pay the asking price for a player under contract until 2021.