The Uruguay striker was unable to train at the start of the week because of the foot injury.
"Luckily, I am better. I felt no pain today and tomorrow I will be able to take part in the whole of training, including activities with the ball," Abreu told the Tenfieldigital website.
The Uruguaya squad is training at a camp in Gotemba, Japan.
Coach Victor Pua is still without another of his key players, midfielder Fabian O'Neill, who is suffering from tendinitis.
"I am feeling better, but the tendon still hurts me a bit. Let's hope tomorrow I will be able to practise normally," O'Neill told Tenfieldigital.
Uruguay plan two more friendlies before the World Cup. On Saturday, they play Japanese side Yokohama Marinos in Gotemba and three days later meet the US national team in Seoul.
The Americans beat Uruguay 2-1 in a match played in Washington recently.