Fantasy Premier League managers looking to bring in the star signings from the final days of the January transfer window should show caution as fitness doubts threaten their debuts this weekend.
Brought in by 84,000+ managers since arriving on Wednesday, Arsene Wenger confirmed that the club-record signing will need to be assessed.
Wenger has also stated that another January transfer, Henrikh Mkhitaryan (£7.6m), will make his first start for Arsenal.
The Armenian's only goal this season was against Everton for Manchester United at Old Trafford in Gameweek 5.
The striker's 12-minute cameo off the bench for Arsenal at Swansea in midweek was his first appearance since Gameweek 18.
The centre-half has played more than 60 minutes in only one of the last six matches, missing out on all four of Chelsea's clean sheets in that spell.
Christensen is the most-sold defender in the Gameweek with 43,000+ managers moving him on.
In-form winger Willian (£6.8m) has returned to training and faces a late assessment for Chelsea.
The Brazilian has three sets of double-digit returns in his last five Gameweek starts.
He could face a Hornets side who have conceded 25 goals at home this season, the most in the league.
That means Ilkay Gundogan (£5.3m) could be handed a fourth successive away start at Turf Moor.
The German delivered 13 points in his previous road trip, at Liverpool in Gameweek 23.
The on-loan striker fired two shots on goal in only 12 minutes to stake a claim on Alan Pardew's starting XI against Southampton, with a favourable schedule to follow.
Four of the Baggies' next six matches score only two in the Fixture Difficulty Rankings (FDR).
Foxes manager Claude Puel has confirmed the Algerian is unavailable for Saturday's home encounter with Swansea City, a second successive Gameweek he will be absent.
Mahrez was the most-sold player ahead of Saturday's 11:30 GMT deadline, departing from more than 141,000 squads. Gray replaced him at Everton, earning a first start since Gameweek 21.
The Swans arrive at King Power Stadium without a clean sheet in each of their last nine away matches.