ROBERTO MANCINI, the Inter Milan manager, last night admitted his players are tired after an exhausting run of matches in Serie A, the Coppa Italia and Europa League, writes Matthew Lindsay.

Mancini's side played their sixth game in under three weeks against Cagliari away in Sardinia in a league game on Monday night and scraped a narrow 2-1 win.

And the former Manchester City boss has warned his players they can't afford to switch off in the second leg of their Europa League last 32 tie with Celtic.

Because he believes the Scottish champions will fight to the last minute after being impressed with them in the 3-3 draw at Parkhead last Thursday night.

He said: "It's normal to be tired when you have come off a European match. Eight of the players played in both the Celtic and Cagliari matches. The fatigue is felt - especially when you play matches close together as happened between the two cup ties and Cagliari.

"We have lost three late goals in recent games to Napoli, Torino and Celtic. I have told the players they must keep total concentration - but the opponents also deserved credit.

"If you win three league games in a row, you are hoping for a week of peace. But we have not had time to relax as we have played a game every three days.

"After good performances and results, we can prepare well for an important match. Three wins doesn't change anything but it does give you confidence.

"When you lose games and don't get results, there is despair. Now, there results are coming. But we cannot relax at all against Celtic - a minute can change everything in this tie."

Mancini added: "The concentration must last until after the game on Thursday. The game will not be easy, you need the utmost concentration.

"We cannot make one mistake because Celtic will never give up - even if they go behind. We saw that in the first game over in Glasgow."

Mancini is optimistic the crowd in the San Siro can play a part in propelling Inter into the next round of the competition.

He said: "The San Siro crowd has always had its weight in helping the team and from them I would not expect anything less in the second leg.

"There will be a lot of people at the game and they can push us through. But it all depends on what we do."