"He could play at the start, come off the bench, not play at all ... everything is possible".
Barcelona missed the service of Lionel Messi who is recuperating from injury, but it was a nice win for them as they stay top of the Spanish La Lagi with 24 points.
"We play with a certain amount of risk, as Barca have always done, but we also want the opposition not to score many", Valverde said when asked if he was concerned about the amount of chances his side are giving up.
"I expect a very complicated game, they have quality in all their lines but Inter have all the conditions to be able to beat them".
"It's a worry for anyone if Messi plays, but the attitude doesn't change".
Rayo Vallecano fans were in good mood during the last seven minutes of the game thinking their team would record an emphatic win over Barcelona.
Messi could make an earlier return than expected against Inter Milan in the San Siro on Tuesday after breaking his arm on Oct 20, but the Catalans have shown some of their strongest form in his absence.
Guardiola parted ways with Messi and Barcelona in 2012, and went on to manage Bayern Munich before guiding the Sky Blues to the Premier League throne last season.
"We know how many goals Luis and Leo have scored together", Ivan Rakitic said after the match.
"This is a club where there is a lot to do". I work on the key projects in the brand evaluation, social impact and global relations that have helped the club a lot.