Do Leeds United need to worry about losing Lewis Cook?
The central midfielder will partner loanee Liam Bridcutt in a new look midfield implemented by new boss Steve Evans, as he seeks to put his stamp on the side, and could even face former side Brentford on Tuesday.
His arrival spells trouble for the player former boss Uwe Rosler brought in on loan, Tom Adeyemi, who already struggles to get into the first team.
The worst case scenario however is that Diagouraga's addition sparks an exit for young midfielder Lewis Cook.
Cook is an outstanding young talent, and as a result has been linked with a transfer to the Premier League this month, with The Mail last week reporting Bournemouth are keen to snap him up.
The Cherries have money to spend, already splashing out £10 million to sign Wolves' star striker Benik Afobe this month.
Leeds recently sold Sam Byram to West Ham, although this was in different circumstances with the club having their hand forced by his contract running down.
The club sought to address this in advance by signing Mustapha Carayol on loan from Middlesbrough, and the hope is that Diagouraga is not a replacement for Cook, but a teammate.
Leeds may still be vulnerable to a big bid for the England youth international, who will now be competing with fellow youngster Alex Mowatt for a more forward role in midfield if Diagouraga and Bridcutt are regular starters.
There is a week until the transfer window closes, and Leeds simply have to resist this long to keep Cook, but long term they must sign him to an extended contract, as his current deal expires in June 2017.
Steve Evans told Radio Yorkshire after the game against Bristol City that the club are determined to hold onto their star youngsters, but every player has a price and in the case of 'outrageous' bids, they would not be able to resisit.
Diagouraga is an exciting arrival for Leeds, and one which strengthens the team, but it will be one step forward and another back if he proves to be an insurance option for Cook's departure this transfer window, the summer, or the following year.