United moved up to third in the Premier League after a 1-1 draw with West Ham and will qualify for the Champions League if they avoid defeat against the Foxes at the weekend.
Speaking to Sky Sports after the draw against West Ham, Solskjaer said: "We started OK but in the last 10-15 minutes of the first half it became a bit frantic.
"We gave them the chance to counter-attack and gave some daft fouls away. They've got players of a good size that are always a danger. The penalty made it hard for us second half.
"We've not been dealt the best of hands with the recovery times in the last couple of weeks but that's because we've been in the FA Cup. That's how it is but we've got three days now ... the extra day before Sunday will make us 100 percent fresh."
The Norwegian manager adds that United have "a great opportunity" to play in the Champions League next term and will be going for a win in the decisive clash with Leicester.
Solskjaer remarked: "We've given ourselves a great opportunity.
"We wanted to give ourselves the chance to head there and get into the Champions League by beating them.
"Now, we'd be OK with a draw, but we'll be going there to win. You'll prepare as you always do to go and win the game."