Sir Alex Ferguson is sweating on the fitness of Louis Saha and Cristiano Ronaldo ahead of Manchester United's Premiership clash with Everton at Old Trafford.
Saha was taken off before the end of Sunday's draw with Chelsea after suffering a slight knock, while Ronaldo failed to return after going down under a hefty challenge from Ashley Cole.
Although Ole Gunnar Solskjaer and Park Ji-Sung are due to return to training this week after overcoming hamstring and ankle injuries respectively, neither will come into consideration for Everton's visit and, with Alan Smith now on a personal fitness programme and Giuseppe Rossi kicking his heels at Newcastle, Ferguson could be left with just Wayne Rooney as an orthodox forward.
Should neither Saha nor Ronaldo make it, Rooney could be joined in attack by Ryan Giggs, with Darren Fletcher and John O'Shea drafted in to fill the vacant midfield slots.
The problem just highlights the lack of depth in Ferguson's squad compared to Chelsea, although the imminent return of Solskjaer and Park is welcome news at such a congested stage of the season.
Solskjaer has already confirmed his well-being with six goals this term, while Park's industry could certainly come in handy as Ferguson looks to ease the burden on Giggs and fellow veteran Paul Scholes.
'Ji-Sung and Ole will begin training this week, which is great news for us,' Ferguson told Manchester United Radio.
'With the hectic December period coming up, it is great we will have those players available.'
Smith could be called on to face the Toffees, even though he looked badly off the pace in a couple of Carling Cup appearances and has not been seen on the bench since the defeat at Southend earlier this month.
'Alan is coming along fine,' said Ferguson. 'We have changed his fitness programme with the first team, now he is doing special training to aid his speed.
'He is responding well and he is enjoying it. He realises there is a lot of hard work involved but he is putting everything into it.'