The Italian was surprisingly sacked by the Baggies in February 2011 but admits that he holds no grudges as his Blues get set for action at The Hawthorns tomorrow.
"I have no grudges," Di Matteo said. "I had a great time. I worked with a lot of good people there.
"The supporters were very kind to me as well. I had almost two years there.
"Despite the fact that last season's game was not a good memory, because we lost, I can reflect on good memories there.
"Look at where I'm sitting now, so I'm not so sure it was a bad thing. That's football. That's life. In a manager's career, you're going to get the sack at some point if you have a long career.
"It's happened to everybody in the industry, and it makes you stronger. It doesn't mean you're not a good coach or a good manager.
"There are many examples of good managers where it didn't work out with a club. They were successful before and were again after."