Late August is no time to hit the panic button, but another loss against a promotion side may well send Manchester United into crisis. PLUS: We head to Germany for the start of the Bundesliga, and Wrexham vs. Birmingham face-off. Ahead of every weekend, I pick the best or most exciting games not to be missed in the world of football.

From derbies to top-of-the-table clashes, relegation six-pointers to world-class players facing each other, or other interesting tactical battles, there will be something for everyone to enjoy. This week, we cover the start of the German Bundesliga, two massive derbies, a clash between Champions League teams, and some managers under pressure too. Barcelona vs. Rayo Vallecano Spanish La Liga, Matchday 2.

Kickoff: Monday, 3:30 p.m. ET / 8:30 p.m. BST. The defending champions enjoyed their first home game of the season on Thursday against Athletic Club, and are back at Camp Nou on Monday to face Rayo Vallecano. In their opener, we saw how sharp they were away from home, destroying Elche 5-0 with energy, flair and efficiency.

Oh, and it was a very experimental lineup: Raphinha played as the No. 9 in the absence of a real striker in the squad after the departures of Robert Lewandowski and Ferran Torres, and was outstanding in his new role. He did everything: leading the press, scoring, running, setting up teammates and fighting for everything in the attacking third. Anthony Gordon came off the bench to dish two assists, and Fermín López was also excellent in the No. 10 role.

Even with an interesting defensive set-up -- Eric García at right back, 19-year-old Xavi Espart at left back -- Barcelona were solid. Manager Hansi Flick will have some key players even sharper physically this weekend and, while that's scary for any opposition, it's especially difficult for Rayo given that they're expected to struggle this season. They have lost promising manager Inigo Perez, who left for Villarreal, and some key players like center back Nobel Mendy (to Hull City) and full back Pep Chavarría (to Chelsea).

They have not won a game so far this season, with a defeat at Sevilla and home draw against Alavés. MY PREDICT ION: Barcelona 3-0 Rayo Vallecano. There will be no real match, as Barcelona will toy with Rayo.

Lamine Yamal was quiet in his first competitive game of the season, but I expect him to be much sharper and decisive in this game. Flick will even be able to rotate for his third game in eight days without it changing the outcome. Pressure is already on Carrick & Co. at Old Trafford Manchester United vs. Ipswich Town English Premier League, Matchday 2.

Kickoff: Sunday, 9:30 a.m. ET / 2:30 p.m. BST. The biggest shock of the Premier League's first weekend was United's 2-0 defeat at newly promoted Hull City on Saturday. It was an embarrassing result and in many ways an embarrassing performance, especially defensively and out of possession.

United have to bounce back on Sunday against another promoted team at Old Trafford. It already feels like a must-win for new manager Michael Carrick, who can't afford to be winless after two games. Carrick did so well after taking over in January that expectations are high now, especially after their impressive transfer business helped their midfield (Youri Tielemans from Aston Villa, Carlos Baleba from Brighton & Hove Albion, and Andrey Santos from Chelsea).

The team didn't look right at Hull and Carrick needs to rally his players and gain some momentum ahead of some difficult games: at Everton in Matchday 3 and hosting Manchester City in Matchday 4.