London, March 13 -- Following Arsenal's win over FC Porto in the UEFA Champions League (UCL) at the Emirates Stadium in London, the Gunners' head coach Mikel Arteta said that it was difficult to generate constant momentum against the visitors.

While speaking at the pre-match press conference, Arteta showered praise on Porto and said that they were a "tough opponent".

The Spanish coach added that they were prepared for the penalties against FC Porto.

When asked about David Raya, the head coach said that the Arsenal goalie had faced a few setbacks earlier in the game but stood up later.

"Magic, what we expected, a really tough opponent, really well organised, very difficult to generate constant momentum in the game in the way they play ...