In the same pan, heat the remaining olive oil. Add the onion, leek, celery, thyme, and rosemary and cook, stirring often, until softened (about 5 minutes). Stir in garlic and cook for 1 minute to soften. Add the mushrooms and cook, stirring occasionally, until softened and any liquid is released, about 5-6 minutes. Add the red wine, tomato paste, Worcestershire sauce and chicken along with any accumulated juices to the pan.
Bring to a boil, then reduce heat to low. Cover and cook, stirring once or twice, until the chicken is tender, about 10 minutes. Taste and add more salt or pepper, if desired.