Phil Jones has been ruled out of Manchester United's Champions League clash with Real Madrid.
Sir Alex Ferguson confirmed on Monday that Jones has not recovered from the ankle injury he sustained during the FA Cup win over Reading a fortnight ago.
Paul Scholes (knee) is also sidelined, although fellow veteran Ryan Giggs is set to make the 1,000th senior appearance of his career.
Ferguson has a number of tough decisions to make, including whether to recall Danny Welbeck after he scored in the 1-1 draw in the first leg at the Santiago Bernabeu.
Real Madrid coach Jose Mourinho has confirmed goalkeeper Iker Casillas is not fit to face Manchester United at Old Trafford.
The Spain international only returned to training on Thursday after sustaining a broken hand against Valencia on January 23 and, although he travelled with the squad, he will not be considered.
Mourinho otherwise has a fully fit squad to choose from and is expected to make changes after resting several key players for the weekend Primera Liga win over Barcelona.
Cristiano Ronaldo will be one of those restored to the starting XI, for a match which marks his first return to United since leaving in a world-record deal in 2009.
Stanley edged out of the drop zone last week thanks to an impressive 3-0 win over local rivals Rochdale in midweek, before playing out a goalless draw at home to Torquay.
But the Reds are still only a solitary point above the foot of the table and Richardson does not want to get ahead of himself.
"I think you'll soon slip up if you look too far ahead," he said.
"If you give yourself targets you either go past them or fall short so I think they're false.
"I think you must just concentrate on the next day and then after that the next game.
"Once that's gone you can put your whole effort and your whole focus on the next obstacle that's put in front of you. That's what we're doing."
The 24-year-old left-sided player has been drafted in by Rams boss Nigel Clough following an hamstring injury to leading goalscorer Jamie Ward against Crystal Palace last Friday.
Forsyth is expected to be eligible to make his County debut at Cardiff on Tuesday.
Manager Nigel Clough said: "Craig is someone we've been aware of for a while and we've been impressed whenever we've seen him in action, so it'll be good to have a look at him a little more closely.
"The injuries we've picked up of late have obviously been frustrating, but it's presented us with a chance to bring Craig in.
"We've got options up front, despite Jamie Ward's injury, with Conor Sammon, Chris Martin, Michael Jacobs and Mason Bennett, but we've been left a little bit short in midfield so Craig's arrival certainly strengthens that area."
Scot Forsyth, who joined Watford from Dundee in June 2011, scored five goals in 22 appearances last season, but has found his first-team opportunities limited this term.
He has made two league appearances and featured twice in the Capital One Cup this campaign. He also spent two months on loan at Bradford City earlier in the season, making six appearances and scoring once.
