The defender jokes that the Reds have "probably had enough injuries for most of the teams in this league" over the course of the campaign.
For the first time in a long time Sir Alex has a virtually fully fit squad, bar long-term absentees Nemanja Vidic and Darren Fletcher. Anderson, Nani and Michael Owen are still working on their recovery from set-backs although the latter pair were due to return to training this week.
Smalling says the players have never let injury set-backs get them down and has praised Sir Alex's selection planning as being key to sustaining a challenge in the title race.
[Our position in the league despite all the injuries] says a lot about Manchester United," Smalling told ManUtd.com.
"No matter the adverse conditions we have, whether it be injuries or a tough run of games, we tend to strive through. You’ve seen the team do that over the years, even before I came to the club.
"The manager deserves a lot of credit for that with regard to how he approaches games and uses his players.
"We’ve probably had enough injuries for most of the teams in this league! Luckily though we’re still where we are and have shown we have the squad to be able to cope. Everyone is coming back at a crucial time."
The Reds will be aiming to maintain their advantage - currently three points - over rivals Manchester City with victory over Blackburn at Ewood Park on Monday night.