Guildford, England — Calvin Johnson doesn't know yet whether he'll play Sunday when the Lions play the Atlanta Falcons at Wembley Stadium in London, but his injured right ankle is improving.

The Lions' All-Pro wide receiver said Tuesday he did some drills on the field last week after more than a week of resting. Johnson missed the past two games and could be out for three-straight games for the first time in his eight-year career.

"I'm going to tell you the same thing every week: I'm getting better; I'll tell you that much," Johnson said. "Moving around a lot more so I'm feeling good."

Reggie Bush (ankle) missed most of the second half Sunday after aggravating an ankle injury, but said he didn't suffer a setback and expects to play against Atlanta.

Fellow running back Theo Riddick (hamstring) also expects to play Sunday after missing the Week 7 win over New Orleans.

The Lions won the last two games despite Johnson's absence with Golden Tate filling in admirably as Matthew Stafford's top target.

Having proved they can win without Johnson, the Lions could exercise caution and give him the next two weeks off, including the idle week that follows this Sunday's game, but Johnson said he plans to return whenever he's ready.

"I'm still working, working to get on the field each and every week," he said. "If I'm good enough to play, I'm going to play. I'll just leave it at that."

A noted soccer fan, Johnson is excited to take the field at Wembley, the home of the English national team.

"It'd be a great experience, looking forward to it," he said.

Johnson also said he's looking forward to exploring London for the first time and hopes to see a soccer match, though he likely won't have a chance to see his favorite club, Manchester City.

"If we have the time, it'd be great to be able to go to a match," he said. "I'm not sure which one, whoever's available, whichever one's closest to us, so we get back for curfew and stuff like that."