Guti can understand City's complaints over Barca's play-acting and the sending off of Martin Demichelis.
"My congratulations go to Barcelona, ??for the umpteenth trickery," tweeted Guti.
On Lionel Messi's spotkick, City midfielder Jesus Navas said: "Was it a penalty? The images speak for themselves. It is unfortunate that a match may be decided like that."
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