The defender has been sidelined since a suffering an ankle injury late in our 2-1 win at Fulham on December 4.
Jan played centrally with Younes Kaboul and they were joined by fellow returnees Paulinho and Sandro at Upton Park.
The team won 3-0 thanks to a double from Harry Kane and fine strike from Paulinho.
“I felt fine, I partnered with Younes, we had a strong team and it was just about the perfect game to come back in,” said Jan.
“I need a little more mobility and training but I played 60 minutes and I’m ready. I’m very happy to be out there again, happy to be back with the lads in the dressing room.”
Jan’s imminent return - whether or not he’s fit to face City on Wednesday - plus the return of Paulinho, Sandro and Younes is timed perfectly as we prepare for huge games against City, Hull, Everton, Newcastle and then our return to Europa League action against Dnipro.
“We’ve won five of the last six, we’re fifth in the table and we want to keep going,” said Jan. “You always need competition for places to progress and everyone wants to play the next game.”