Park OUT, Valencia IN

We are set to lose Park Ji-sung for up to four weeks after he tweaked a hamstring in training before the Derby.

The 29-year-old South Korean has only just returned following his international involvement.

Park, who picked up his 100th cap against Japan, has since retired from international football to concentrate on his United career.

"We got a blow on Saturday morning with the news that Ji-sung Park did his hamstring on Friday afternoon in training," the boss explained to ManUtd.com. "It was very unfortunate because it was his last kick of the ball in training as well. We were really looking forward to having him back after being away for a month at the Asian Cup. He’ll be out for up to a month, which is a blow to us."

Defender Jonny Evans has had a scan on an ankle injury and could be out for a month also.

But on the other hand, Antonio Valencia is back training with the reserves. The winger faced ligament damage in an innocuous challenge during United's 0-0 Champions League draw with Rangers at Old Trafford in September.

"The good news is that Valencia started training with the Reserves on Saturday," added the boss. "So he’s on his way back and that will be a real boost to have him available for the run-in."

Valencia to make a comeback against Marseille at Old Trafford

Antonio Valencia, who got injured in the Champions League against Rangers is making progress to face Marseille at home.

United winger Antonio Valencia is returning to his full fitness and might face Marseille in the second leg of the knockout stage of Champions League against Marseille. After getting seriously injured against Glasgow Rangers in a Champions League clash in September 2010, Valencia is making good progress to return to professional football. He needed a surgery to repair the fracture and the ligament damage he suffered in that game. Watch the injury video of the strong winger by clicking here

Although the Equadorian will miss the first away leg in France which takes place on 23rd February, he is certain to play in the home fixture on 15th March. 

This is what the manager had to say: "He's making the progress exactly the way we thought. It's looking like the end of February or beginning of March." Sir Alex added "He should be back training in five to six weeks time, but given the extent of the injury, we'll give him more time to get into the full flow of things"

Rio Ferdinand recently tweeted about Valencia's progress  "I saw Valencia in the gym today...the guy throws the wieghts around like how I threw @RobbieSavage8 about! #strongestwingerinthegame #fact "

The month of March is very crucial for Manchester United. We face Chelsea on 1st March followed by Liverpool on 5th March and Marseille in the Champions League 10 days later. Valencia's name on United's squad sheet would definitely bolster United's attack and perhaps maintain our defeatless run.