The Argentinian star is yet to make an appearance this season having suffered a calf injury in August but travelled to Germany with his team-mates.
Speaking at a pre-match press conference, Valverde said: “We’ll decide tomorrow whether Messi is going to play. We weren’t sure a week ago, but there’s been a lot of progress.”
Valverde is considering starting Luis Suarez after he returned from his own injury problems with two goals as a substitute against Valencia in LaLiga on Saturday.
He must also decide whether to hand another start to 16-year-old wonderkid Ansu Fati, who could become the Champions League’s youngest ever goal scorer.
Fati became Barcelona’s youngest scorer when he netted against Osasuna prior to the international break and he followed up with a goal and an assist on his full debut against Valencia.
Valverde said: “We’re thrilled with Ansu Fati, but we all have to take care of him. If he plays tomorrow, it won’t be to break records, but rather because the team needs him.”
The clash will be the first in the Champions League between Dortmund and Barcelona, whose only previous meetings came in the UEFA Super Cup in 1997.
Provided by Press Association Sport
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